Question 1 :
The correct combination of terms with reference to an animal cell is _____.
Question 2 :
State TRUE or FALSE: Gene controls the transfer of a hereditary characteristic from parents to offspring.
Question 4 :
State True or False for the following statement:-
The size of the cells has no relation with the size of the body of the animal or plant.
Question 5 :
The cells having well-organised nucleus with a nuclear membrane are designated as ________.
Question 6 :
The units of inheritance present on the chromosomes are known as _________
Question 12 :
The basic components of a cell are cell membrane, cytoplasm and _____________.
Question 13 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d04df59b460d7261f2c3.PNG' />
The cell shown in the above image represents
Question 15 :
A white blood cell (WBC) in human blood is another example of _____________which can change its shape
Question 16 :
Which one of the following term is not a part of the nucleus?
Question 17 :
Fill in the blanks. The outermost layer of plant cells is the (a) _______ beneath which is the (b)______ . The term (c)_______ refers to the jelly-like substance containing all the (d)______ . The (e)_______ contains thread-like structures called (f)________ .
Question 21 :
Green colour of leaves is due to presence of the pigment_____
Question 22 :
Paheli accidentally placed her hand over a flame and immediately pulled it back. She felt the sensation of heat and reacted due to the action of
Question 25 :
Which of the following statements are true for eukaryotic cells?
(i)They do not have a nuclear membrane.
(ii)They have a well organised nucleus.
(iii)They have a nuclear membrane.
(iv)Blue green algae are eukaryotic cells.
Question 28 :
Majority of cells cannot be seen directly with our naked eyes because
Question 29 :
Under a microscope Paheli observes a cell that has a cell wall but no distinct nucleus. The cell that she observes is
Question 30 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d04cf59b460d7261f2c2.PNG' />
The cell shown in the above image represents
Question 31 :
Which of these is the short note on nucleus of cell.
Question 32 :
In leaves, name the pigment that is responsible for green colour
Question 33 :
Under a microscope Paheli observes a cell that has a cell wall but no distinct nucleus. The cell that she observes is
Question 34 :
Of the following parts of a cell listed below, name the part that is common to plant cell, animal cell and a bacterial cell.
Question 38 :
Nucleus is separated from the cytoplasm by a membrane called the _____________.
Question 40 :
Majority of cells cannot be seen directly with our naked eyes because
Question 42 :
The entire content of a living cell is known as _________
Question 43 :
The change in shape of amoeba is due to formation of pseudopodia which facilitates movement and help ___________.
Question 44 :
I am like a policeman. I do not allow anything and everything to get in and out of the cell. Who am I?
Question 45 :
The entire content of a living cell is known as _________
Question 46 :
The basic living unit of an organism is an organ. State true or false.
Question 50 :
Amoeba has no definite shape, unlike other organisms. They has projections of varying lengths protruding out of its body that keeps on changing. These are called _______.
Question 51 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d054f59b460d7261f2cd.PNG' />
In the image above, Boojho set up this circuit for purification of copper. What will be the nature of plate B?
Question 52 :
Heating effect of electric current is the effect of current responsible for the glow of the bulb in an electric circuit.
Question 53 :
When electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates
Question 54 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d050f59b460d7261f2c8.PNG' />
In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. Why did the bulb not glow in A?
Question 55 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d059f59b460d7261f2d3.PNG' />
From the above image, we can see that Boojho and Paheli performed experiments taking similar bulbs and cells but two different solutions A and B. They found that the bulb in the setup A glows more brightly as compared to that of the setup B. You would conclude that
Question 56 :
When electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates
Question 57 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05cf59b460d7261f2d7.PNG' />
In the image above, will the bulb glow. Write ‘Yes’ or ‘No’
Question 58 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d057f59b460d7261f2d0.PNG' />
In the image above, Boojho set up this circuit for purification of copper. What will be the nature of the solution?
Question 61 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05ef59b460d7261f2d9.PNG' />
In the image above, will the bulb glow. Write ‘Yes’ or ‘No’
Question 62 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d059f59b460d7261f2d3.PNG' />
From the above image, we can see that Boojho and Paheli performed experiments taking similar bulbs and cells but two different solutions A and B. They found that the bulb in the setup A glows more brightly as compared to that of the setup B. You would conclude that
Question 63 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d056f59b460d7261f2cf.PNG' />
In the image above, Boojho set up this circuit for purification of copper. What will be the nature of plate A?
Question 64 :
A coating of zinc is provided to protect iron from corrosion and rust.
Question 65 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d057f59b460d7261f2d0.PNG' />
In the image above, Boojho set up this circuit for purification of copper. What will be the nature of the solution?
Question 66 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d058f59b460d7261f2d2.PNG' />
In the above image, which of the following solutions will not make the bulb glow?
Question 68 :
One of the most common applications of chemical effect of electric current is __________.
Question 69 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d050f59b460d7261f2c7.PNG' />
Current does not flow in the circuit if there is a gap between the two wires. Does air never conduct electricity?
Question 70 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05cf59b460d7261f2d7.PNG' />
In the image above, will the bulb glow. Write ‘Yes’ or ‘No’
Question 71 :
One of the most common applications of chemical effect of electric current is __________.
Question 73 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d053f59b460d7261f2cb.PNG' />
In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. What would be the effect of increase in the number of turns in the coil wound around the magnetic compass in B?
Question 74 :
Electroplating of ______________ is done on objects like water taps and cycle bell to give them a shiny appearance.
Question 75 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d050f59b460d7261f2c7.PNG' />
Current does not flow in the circuit if there is a gap between the two wires. Does air never conduct electricity?
Question 76 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05cf59b460d7261f2d6.PNG' />
In the image above, will the bulb glow. Write ‘Yes’ or ‘No’
Question 77 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d055f59b460d7261f2ce.PNG' />
In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. What does the deflection in magnetic compass indicate?
Question 78 :
Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory
Question 79 :
Small amount of a mineral salt present naturally in water makes it a ____________ of electricity.
Question 80 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d051f59b460d7261f2c9.PNG' />
In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. What will be observed if the number of cells are increased in the circuit shown in B?
Question 81 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d051f59b460d7261f2c9.PNG' />
In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. What will be observed if the number of cells are increased in the circuit shown in B?
Question 82 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05ef59b460d7261f2d9.PNG' />
In the image above, will the bulb glow. Write ‘Yes’ or ‘No’
Question 84 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05ff59b460d7261f2da.PNG' />
In the image above, will the bulb glow. Write ‘Yes’ or ‘No’
Question 87 :
Heating effect of electric current is the effect of current responsible for the glow of the bulb in an electric circuit.
Question 88 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05ff59b460d7261f2da.PNG' />
In the image above, will the bulb glow. Write ‘Yes’ or ‘No’
Question 89 :
A coating of zinc is provided to protect iron from corrosion and rust.
Question 91 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d058f59b460d7261f2d1.PNG' />
Current does not flow in the circuit if there is a gap between the two wires. Does it indicate that air is a poor conductor of electricity?
Question 92 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d055f59b460d7261f2ce.PNG' />
In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. What does the deflection in magnetic compass indicate?
Question 93 :
Which of the following metals is used in electroplating to make objects appear shining?
Question 94 :
Which of the following metals is used in electroplating to make objects appear shining?
Question 95 :
Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory
Question 96 :
Small amount of a mineral salt present naturally in water makes it a ____________ of electricity.
Question 97 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d058f59b460d7261f2d2.PNG' />
In the above image, which of the following solutions will not make the bulb glow?
Question 98 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d058f59b460d7261f2d1.PNG' />
Current does not flow in the circuit if there is a gap between the two wires. Does it indicate that air is a poor conductor of electricity?
Question 99 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d056f59b460d7261f2cf.PNG' />
In the image above, Boojho set up this circuit for purification of copper. What will be the nature of plate A?
Question 100 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d050f59b460d7261f2c8.PNG' />
In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. Why did the bulb not glow in A?
Question 102 :
Coal is formed from dead vegetation. What is this process called?
Question 104 :
State True or False. Forests and coal are exhaustible natural resources.
Question 105 :
What are the advantages of using CNG and LPG as fuels?
Question 107 :
State True or False. Petroleum, coal and natural gas are fossil fuels.
Question 108 :
State True or False.The slow process of conversion of dead vegetation into coal is called carbonisation .
Question 110 :
State True or False. Natural gas is stored under high pressure as compressed natural gas.
Question 113 :
State True or False. Natural gas cannot be used for power generation.
Question 114 :
State true or false. LPGs and CNGs give a lot of heat energy when burnt.
Question 115 :
State true or false. LPGs and CNGs give a lot of heat energy when burnt.
Question 117 :
Name the petroleum product used as fuel for stoves, lamps and jet crafts.
Question 118 :
State True or False.Under high temperature and pressure, dead plants get slowly converted to coal.
Question 119 :
Process of separation of different constituents from petroleum is called ___________
Question 120 :
State True or False. Coal is one of the fuels used to cook food.
Question 122 :
Naphthalene balls are obtained from coal tar and are used as
Question 123 :
State True or False. Resources which are present in unlimited quantity in nature are called exhaustible natural resources.
Question 124 :
State True or False. Resources which are present in unlimited quantity in nature are called exhaustible natural resources.
Question 126 :
State True or False .The process of separating the various constituents of petroleum is known as refining.
Question 128 :
State True or False .The process of separating the various constituents of petroleum is known as refining.
Question 129 :
When heated in air, coal burns and produces mainly ________ gas.
Question 131 :
State True or False.The slow process of conversion of dead vegetation into coal is called carbonisation .
Question 132 :
State True or False. Coal tar is a black, thick liquid with an unpleasant smell.
Question 133 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d061f59b460d7261f2dd.png ' />
From the above image,match the items given in Column I with the items of Column II.
Question 134 :
State True or False. Natural gas is stored under high pressure as compressed natural gas.
Question 136 :
State True or False.During the processing of coal to get coke, coal tar and coal gas are also obtained
Question 137 :
State true or false. LPGs and CNGs are clean fuels and do not give smoke when burnt.
Question 138 :
State True or False. Natural gas cannot be used for power generation.
Question 139 :
State True or False. The disadvantage of natural gas is that it can not be used directly for burning in homes.
Question 141 :
Which of the following is a pair of exhaustible natural resources?
Question 143 :
State True or False. Coal and petroleum are formed from the dead remains of organisms and are known as fossil fuels.
Question 144 :
State True or False. It is difficult to transport natural gas through pipes.
Question 147 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d061f59b460d7261f2dd.png ' />
From the above image,match the items given in Column I with the items of Column II.
Question 149 :
When heated in air, coal burns and produces mainly ________ gas.
Question 150 :
State True or False. Oxygen in air is an exhaustible natural resource.
Question 157 :
The type of combustion in which a material suddenly bursts into flames, without the application of any apparent cause is called as-
Question 159 :
State true or false. Calorific value of wood is higher than that of coal.
Question 161 :
Fill in the blank: A liquid fuel used in homes is __________.
Question 162 :
You are provided with three watch glasses containing milk, petrol and mustard oil, respectively. Suppose you bring a burning candle near these materials one by one, which material(s) will catch fire instantly and why?
Question 166 :
When the clothes of a person catch fire, the person is covered with a __________ to extinguish fire.
Question 170 :
The conditions under which combustion can take place is/are (i) Presence of fuel (ii) Air (or oxygen) (iii) Ignition temperature
Question 171 :
The calorific value of a fuel is expressed in a unit called
Question 175 :
State TRUE or FALSE: The lowest temperature at which a substance catches fire is called its ignition temperature
Question 180 :
Fill in the blank: Fire produced by oil cannot be controlled by _________.
Question 181 :
Small pieces of pinewood dipped in ______were used as matches in ancient Egypt.
Question 185 :
Choose the incorrect statement from the following. Forest fires are usually due to:
Question 186 :
Increased concentration of carbon dioxide in the air is believed to cause ____
Question 187 :
The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its______value.
Question 191 :
A chemical process in which a substance reacts with oxygen to give off heat is called __________.
Question 192 :
The calorific value of a fuel is expressed in a unit called-
Question 193 :
The unburnt carbon particles are dangerous pollutants causing respiratory diseases, such as asthma. True or False.
Question 194 :
If a person’s clothes catches fire, the best way to extinguish the fire is to:
Question 196 :
State true or false. Carbon dioxide is an excellent fire extinguisher.
Question 199 :
The substances which have very low __________ temperature and can easily catch fire with a flame are called __________ substances.
Question 200 :
A ____________ process in which a substance reacts with __________ to give off heat is called combustion.
Question 201 :
What are the examples of endemic flora of the Pachmarhi Biosphere Reserve?
Question 202 :
Which one of the following changes may occur due to desertification?
Question 203 :
A place where animals are protected in their natural habitat is known as?
Question 204 :
Which of the following feature is correct for a wildlife sanctuary?
Question 205 :
In our country, large patches of forests are being cleared for cultivation of crops. The environmental impact of such a practice will lead to ________.
Question 207 :
What do black buck, elephant, python and golden cat together represent in a forest?
Question 209 :
Which one of the following statements is true about a biosphere reserve?
Question 210 :
Can a forest regenerate naturally in a short period of time?
Question 211 :
Migratory birds fly to far away areas during a particular time of a year. Which of the following conditions present in their habitat during that time are responsible for this behaviour? (i) Unavailability of food. (ii) Extreme weather conditions. (iii) Over crowding. (iv) Lack of nesting areas.
Question 212 :
An ecosystem is made of all the plants, animals and microorganisms in an area along with non-living components such as climate, soil, river deltas etc? Is it TRUE OR FALSE.
Question 214 :
To protect our flora and fauna and their habitats, protected areas called _______?
Question 215 :
The place meant for conservation of biodiversity in their natural habitat are: (i) Zoological garden (ii) Botanical garden (iii) Wildlife sanctuary (iv) National park.
Question 216 :
To protect our flora and fauna and their habitats, protected areas called _______?
Question 217 :
Project Tiger was launched by the government to protect the tigers in the country. What was the objective of this project ?
Question 218 :
Endemic species are those species of plants and animals which are found exclusively in a particular area. Is it TRUE OR FALSE?
Question 219 :
The animals found in a particular area is termed as ______ ?
Question 221 :
The increase in temperature on the earth disturbs the water cycle and may reduce rainfall. This could cause __________?
Question 222 :
Clearing of forests (by cutting down forest trees)over a wide area is called _______?
Question 223 :
What are the examples of endemic flora of the Pachmarhi Biosphere Reserve?
Question 224 :
What is that part of the earth in which living organisms exist or which supports life?
Question 227 :
Which of the following is the first Reserve Forest of India?
Question 228 :
What are the examples of endemic flora of the Pachmarhi Biosphere Reserve?
Question 229 :
Red Data Book is the source book which keeps a record of all the____________ animals and plants?
Question 231 :
Removal of the top layer of the soil exposes the lower, hard and rocky layers. This soil has less humus and is less fertile. Gradually the fertile land gets converted into deserts. It is called __________?
Question 233 :
Animals whose numbers are diminishing to a level that they might face extinction are known as the ________ ?
Question 234 :
What is that part of the earth in which living organisms exist or which supports life?
Question 235 :
Do Migratory birds fly for laying eggs as the weather in their natural habitat becomes very cold and inhospitable?
Question 236 :
Endemic species are those species of plants and animals which are found exclusively in a particular area. Is it TRUE OR FALSE?
Question 237 :
Project Tiger was launched by the government to protect the tigers in the country. What was the objective of this project ?
Question 238 :
If cutting of trees continues,rainfall and the fertility of the soil will decrease.TRUE or FALSE
Question 239 :
State true or false. Plants of a particular area are collectively termed as fauna.
Question 241 :
What will happen if the top layer of the soil is exposed?
Question 243 :
In our country, large patches of forests are being cleared for cultivation of crops. The environmental impact of such a practice will lead to ________.
Question 244 :
A place for Large areas of protected land for conservation of wild, plant and animal resources and traditional life of the tribals living in the area is known as ?
Question 245 :
Which one of the following changes may occur due to desertification?
Question 246 :
An ecosystem is made of all the plants, animals and microorganisms in an area along with non-living components such as climate, soil, river deltas etc? Is it TRUE OR FALSE.
Question 247 :
Which one of the following statements is true about endemic species?
Question 248 :
State true or false. There can be a wildlife sanctuary within a biosphere reserve.
Question 249 :
Project Tiger was launched by the government to protect the tigers in the country. What was the objective of this project ?
Question 250 :
__________ is restocking of the destroyed forests by planting new trees.
Question 251 :
A gas filled balloon moves up. Is the upward force acting on it larger or smaller than the force of gravity?
Question 253 :
While sieving grains, small pieces fall down. Which force pulls them down?
Question 254 :
State true or false: The force of gravitation exist between two astronauts in space
Question 255 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d06ff59b460d7261f2ed.PNG' />
In the above image, a circuit is shown when the key is closed, the compass needle placed in the match box deflects. Name the force which causes this deflection.
Question 256 :
A girl is pushing a box towards east direction. In which direction should her friend push the box so that it moves faster in the same direction?
Question 257 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d06cf59b460d7261f2ea.PNG' />
In the above image, a car is shown sticking to an electromagnet. Name the forces acting on the car?
Question 258 :
A ball of dough is rolled into a flat chapati. What is the name of the force exerted to change the shape of the dough?.
Question 259 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d06bf59b460d7261f2e9.PNG' />
In the above image, a man with a parachute is shown. Name the force which is responsible for his downward motion?
Question 260 :
Fruits detached from a tree fall down due to force of gravity. We know that a force arises due to interaction between two objects.Which of the following is(are) the objects interacting in this case?
Question 261 :
A man is pushing a cart down a slope. Suddenly the cart starts moving faster and he wants to slow it down. What should he do?
Question 262 :
State true or false: Force of gravity act on dust particles
Question 263 :
During dry weather, clothes made of synthetic fibre often stick to the skin. Which type of force is responsible for this phenomenon?
Question 264 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d069f59b460d7261f2e6.PNG' />
In the above image, a container is filled with water. Which of the following statements is correct about pressure of water?
Question 265 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d066f59b460d7261f2e2.PNG' />
In the above image, Two rods of the same weight and equal length have different thickness are shown.They are held vertically on the surface of sand.Which one of them will sink more?
Question 266 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d06df59b460d7261f2eb.PNG' />
In the above image, a man with a parachute is shown. Will he come down with the same speed without the parachute?
Question 267 :
A chapati maker is a machine which converts balls of dough into chapati’s. What effect of force comes into play in this process?
Question 268 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d067f59b460d7261f2e4.PNG' />
In the above image, two boys A and B are shown applying force on a block. If the block moves towards the right, which one of the following statements is correct?
Question 269 :
During dry weather, while combing hair, sometimes we experience hair flying apart. The force responsible for this is
Question 270 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d068f59b460d7261f2e5.PNG' />
In the above image, when the circuit is completed, the hammer strikes the gong. Which of the following force is responsible for the movement of hammer?
Question 271 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d06af59b460d7261f2e7.PNG' />
In the above, image, A water tank has four taps fixed at points A, B, C, D is shown. The water will flow out at the same pressure from taps
Question 273 :
Two objects repel each other. This repulsion could be due to
Question 274 :
Two persons are applying forces on two opposite sides of a moving cart. The cart still moves with the same speed in the same direction.What do you infer about direction of the forces applied.?
Question 275 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d06ef59b460d7261f2ec.PNG' />
In the above image, a car is shown sticking to an electromagnet. Out of all the forces acting on the car which one of them is larger?
Question 276 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d06bf59b460d7261f2e8.PNG' />
In the above image, A brick is kept in three different ways on a table as shown in figure.The pressure exerted by the brick on the table will be
Question 277 :
State true or false: It is difficult to cut cloth using a pair of scissors with blunt blades.
Question 278 :
Two thermocol balls held close to each other move away from each other. When they are released, name the force which might be responsible for this phenomenon
Question 279 :
Two persons are applying forces on two opposite sides of a moving cart. The cart still moves with the same speed in the same direction.What do you infer about the magnitudes of forces applied?
Question 281 :
Which activity of the farmer can promote growth of earthworms and microbes in the field?
Question 284 :
Using good quality seed is the only criterion to get high yield
Question 286 :
The monsoon season in our country is during the months of ________.
Question 288 :
Beera, wants to practice crop rotation in his field. Suggest a Rabi crop and a Kharif crop which will replenish his field with nitrogen and why?
Question 290 :
Match the agricultural implement with the following options given Sickle is related to
Question 291 :
Paddy is a major cereal crop in our country. Discuss the method of sowing?
Question 293 :
Despite favourable climatic conditions,a farmer's crop failed to give good yield. Give the possible reasons for this.
Question 296 :
Name the tool used with tractor for sowing seeds in a field.
Question 297 :
Growing different crops in different seasons in the same field will deplete the soil of nutrients
Question 298 :
Match the agricultural implement with the following options given Hoe is related to
Question 299 :
Keeping crop grains for a long time under proper conditions is known as.
Question 301 :
Read the statements given below
1.Seeds require moisture for germination
2.Plants can absorb nutrients mostly in dissolved form
3.Irrigation protects crops from both frost and hot air current
4.Irrigation improves soil texture.
Choose the combination of statements which indicate the need to irrigate crops.
Question 303 :
The same kind of plants grown and cultivated on a large scale at a place is called _______________.
Question 305 :
The term used for the separation of grains from chaff is called as _______.
Question 306 :
Paddy is a major cereal crop in our country. What measures must be taken to prevent spoilage and insect attack of harvested grains.
Question 308 :
Paddy is a major cereal crop in our country. In which season is paddy cultivated?
Question 312 :
Which of the following condition is not essential to grow maize?
Question 314 :
The process of loosening and turning of soil is called as _______.
Question 316 :
Match the agricultural implement with the following options given Seed drill is related to
Question 319 :
Terms related to agricultural practice are given below. Rearrange them in the correct sequence. harvesting, sowing, manuring, tilling and ploughing, irrigation, weeding
Question 320 :
Which of the following are the advantages of using the tool which is used with tractor for sowing seeds in a field.
Question 321 :
Certain plants of same kind grown on a large scale is known as.
Question 322 :
For growing a crop, suficient sunlight,_____________ and _______________ from the soil are essential.
Question 323 :
Which of the following statement is not true for organic manure?
Question 325 :
Name the practice followed for large scale rearing of farm animals?
Question 327 :
The system of irrigation where in water is supplied drop by drop near the roots of plants,is called as _________.
Question 329 :
Which of the following tools would a farmer use to remove weeds from the field?
Question 330 :
Which metals are soft and can be cut with a knife?
Question 331 :
Generally, metals are malleable and ductile. Non-metals do not have these properties.
Question 336 :
The metal which produces hydrogen gas on reaction with dilute hydrochloric acid as well as sodium hydroxide solution is
Question 337 :
Can you hold a hot metallic Pan when is without a plastic or wooden handle?
Question 342 :
Litmus indicator solution turns red in acidic solutions and blue in alkaline solutions?
Question 344 :
A more reactive metal can replace a less reactive metal, but a less reactive one cannot replace a more reactive metal. TRUE/FALSE
Question 346 :
Phosphorus is a very reactive non-metal. It catches fire if exposed to air, to prevent the contact of phosphorus with atmospheric oxygen, it is stored in _______
Question 350 :
Is it TRUE OR FALSE, Copper displaces zinc from zinc sulphate solution?
Question 351 :
Which of the following property is not responsible for copper to be used as electrical conduction wires?
Question 352 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0def59b460d7261f37b.JPG' />
From the above image, Is the above equation correct if saloni took a piece of burning charcoal and collected the gas evolved in a test tube?
Question 355 :
Which of the following non-metals reacts and catches fire on exposure to air?
Question 357 :
Which non-metal is essential for our life and all living beings inhale it during breathing?
Question 358 :
What is the sequence of metals from more reactive to less reactive among zinc, iron and copper?
Question 361 :
Oxides of non-metals and metals are acidic in nature. True or False
Question 366 :
The name of the product formed in the reaction of sulphur and _____________ is sulphur dioxide gas.
Question 368 :
What is the property of metal by which it can be drawn into wires is called?
Question 369 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d081f59b460d7261f306.PNG' />
From the image above, find out the names of three non metals
Question 370 :
What happens when Iron nails are placed in copper sulphate solution?
Question 371 :
Materials which can be drawn into wires are called ductile. Which of the following is not a ductile material?
Question 373 :
A less reactive metal replaces a more reactive metal from its salt solution in water. True or False
Question 374 :
The property of metals by virtue of which they can be drawn into wires is called ductility. True or False
Question 375 :
Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with dilute hydrochloric acid?
Question 377 :
Some metals react with water to produce metal hydroxides and hydrogen gas. Generally, nonmetals do not react with water.
Question 378 :
When a copper vessel is exposed to moist air for long, it acquires a dull green coating. TRUE OR FALSE?
Question 379 :
Metals are good conductor of electricity but poor conductor of heat. True or False
Question 381 :
Friction opposes relative motion between the surfaces of the book and the table. True or false?
Question 383 :
A boy rolls a rubber ball on a wooden surface. The ball travels a short distance before coming to rest. To make the same ball travel longer distance before coming to rest, he may
Question 384 :
If you roll a pencil from an inclined plane, then cover the surface by cloth and roll the pencil again. In which case does it travel the least distance?
Question 385 :
You spill a bucket of soapy water on a marble floor accicdentally . Would it make it easier or more difficult for you to walk on the floor?
Question 387 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d071f59b460d7261f2f0.PNG' />
In the above image, While playing tug of war Preeti felt that the rope was slipping through her hands. Which of the following is a way out for her to prevent this?
Question 388 :
Does the distance covered depend on the nature of the inclined surface on which the object rolls over?
Question 389 :
A toy car released with the same initial speed will travel farthest on
Question 390 :
In fact, when a machine is operated, heat generated causes much wastage of _________.
Question 393 :
Four children wore asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below. Choose the correct arrangement.
Question 394 :
How do objects overcome the force of friction exerted by fluids on them?
Question 396 :
In science, the common name of gases and liquids is _______.
Question 397 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d072f59b460d7261f2f2.PNG' />
In the above image, two boys are shown applying force on a box. If the magnitude of the force applied by each is equal, will the box experience any force of friction?
Question 398 :
The frictional force on an object in a fluid depends on its ____ with respect to the fluid.
Question 401 :
If you place a book over 3 cylindrical pencils and push it, is it easier to move the book this way?
Question 402 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0daf59b460d7261f376.PNG' />
From the above figure, if you tie a string around a brick and pull it by spring balance and then wrap a polythene on it and repeat the activity, will the spring balance measurement show any difference?
Question 403 :
If an object started moving, it would never stop if there were no friction.
Question 404 :
What is easier to move the box from rest, or to move it when it is already in motion?
Question 405 :
Why the surface of mortar and pestle (silbatta) used for grinding is etched again after prolonged use?
Question 406 :
Alida runs her toy car on a dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be
Question 407 :
If you roll a pencil from an inclined plane, then cover the surface by cloth and roll the pencil again. In which case does it travel the farthest distance?
Question 409 :
Which force comes into play when you push a book on a table?
Question 410 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d070f59b460d7261f2ef.PNG' />
In the above image, a boy is shown pushing the box from right to left.The force of friction will act on the box
Question 411 :
Will force of friction come into play when a rain drop rolls down a glass window pane?
Question 413 :
Spring balance consists of ________ which gets stretched when a force is applied to it.
Question 415 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d072f59b460d7261f2f1.PNG' />
In the above image, Two blocks of iron of different masses are kept on a cemented floor.Which one of them would require a larger force to move it from the rest position?
Question 416 :
It is obvious that the force of friction will ______ if the two surfaces are pressed harder.
Question 418 :
What happens to the strength of frictional force when logs are lifted by placing logs under it?
Question 420 :
We have two identical metal sheets. One of them is rubbed with sand paper and the other with ordinary paper. The one rubbed with sand paper shines more than the other due to which of the following reasons?
Question 421 :
Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor . Who will have to apply a larger force?
Question 422 :
The handle of a cricket bat or a badminton racquet is usually rough. Which of the following is the reason for it?
Question 425 :
State true or false: There is a force of friction between the wheels of a moving train and iron rails.
Question 428 :
You spill a bucket of soapy water on a marble floor accidentally. Would it make it easier or more difficult for you to walk on the floor?
Question 429 :
Friction opposes the ___________ between the surfaces in contact with each other.
Question 430 :
How many times is a ray of light reflected by two plane mirrors placed parallel and facing each other?
Question 431 :
The lens focuses light on the back of the eye, on a layer called?
Question 432 :
Which one of the following is an example of illuminated object?
Question 434 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0fbf59b460d7261f3a1.PNG' />
Refer to the above figure. Can Paheli at B see the position of the image of an object situated at A in the plane mirror ?
Question 435 :
Which part of the eye gets affected if someone is suffering from cataract?
Question 436 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0dbf59b460d7261f377.JPG' />
From the above image,Find out the position of the image of an object situated at A in the plane mirror.
Question 437 :
The size of the pupil becomes ______ when you see in dim light.
Question 439 :
Fill in the blanks: The size of the pupil becomes__________ when you see in dim light.
Question 441 :
Behind the cornea, we find a dark muscular structure called _____ ?
Question 442 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0dcf59b460d7261f379.JPG' />
From the above image, Can Boojho at C see this image?
Question 443 :
The outer coat of the eye is white. It is tough so that it can protect the interior of the eye from accidents. Its transparent front part is called ______?
Question 444 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d07ef59b460d7261f303.jpg' />
Look at the above image. Can the image of the child in it be obtained on a screen?
Question 445 :
After striking the mirror, the ray of light is reflected in another direction The ray that comes back from the surface after reflection is known as the ___________ ?
Question 446 :
The most popular resource for visually challenged persons is Braille, it was developed by?
Question 447 :
After striking the mirror, the ray of light is reflected in another direction. The light ray, which strikes any surface, is called ________ ?
Question 448 :
The angle between the normal and the reflected ray is known as the ___________ ?
Question 450 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on a Piece of paper?
Question 452 :
The distance between the object and its image formed by a plane mirror appears to be 24 cm. What is the distance between the mirror and the object?
Question 455 :
How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?
Question 456 :
A person 1 m in front of a plane mirror seems to be _______ m away from his image.
Question 457 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on Cardboard surface?
Question 458 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d07df59b460d7261f301.jpg' />
A small hole P is made in a piece of cardboard as shown in the above figure. The hole is illuminated by a torch. The pencil of light coming out of the hole falls on a mirror. At which point should the eye be placed so that the hole can be seen?
Question 459 :
The objects which shine in the light of other objects are called illuminated objects. Is it TRUE OR FALSE?
Question 461 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d07ef59b460d7261f302.jpg' />
In the above figure of the human eye, the cornea is represented by the letter
Question 462 :
Eyes of the nocturnal birds have large cornea and a large pupil.
How does this structure help them?
Question 464 :
Which of the following statements is correct regarding rods and
cones in the human eye?
Question 465 :
Fill in the blanks: A person 1 m in front of a plane mirror seems to be _____ away from his image?
Question 466 :
Fill in the blanks: If you touch your _______ ear with right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with the left hand.
Question 467 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on Mirror?
Question 469 :
The number of images formed by mirrors placed at an angle to one another to make numerous beautiful patterns is used in a _________ ?
Question 470 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d07cf59b460d7261f300.jpg' />
In the above figure, two mirrors A and B are placed at right angles to each other. A ray of light incident on mirror A at an angle of $25^\circ$ falls on mirror B after reflection. The angle of reflection for the ray reflected from mirror B would be
Question 471 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d078f59b460d7261f2fa.jpg' />
Boojho planned an activity to observe an object A through pipes as shown in the above figure, so that he could see objects which he could not directly see. How many mirrors should he use to see the objects?
Question 472 :
In the iris, there is a small opening called the __________?
Question 473 :
The angle between the normal and incident ray is called the ___________ ?
Question 474 :
Choose the correct option, Image formed by a plane mirror is?
Question 475 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0faf59b460d7261f3a0.PNG' />
Refer to the above figure. Boojho stands at A just on the side of a plane mirror as shown in figure. Can he see the image of objects situated at P, Q and R?
Question 477 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on White Chalk powder that is used in school?
Question 478 :
If the angle of incidence ray is given $30^{\circ}$, then what is the angle of reflection?
Question 479 :
lf you touch your _________ ear with your righthand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with _______ .
Question 481 :
The mother is responsible for the sex of her child. Is this a myth?
Question 483 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0eff59b460d7261f391.png' />
From the above image, fill in the crossword puzzle using the following hint: Protuding voice box in boys
Question 484 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d094f59b460d7261f31f.PNG' />
In the above figures, observe the chart and graph given carefully and answer the following questions. Which line represents the height of girls?
Question 486 :
Name the hormone which would be released during the following situations: development of caterpillar to moth.
Question 487 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d098f59b460d7261f324.PNG' />
In the above figures, observe the chart and graph given carefully and answer the following questions. Which line represents the height of boys?
Question 488 :
State true or false. The period of life, when the body undergoes changes, leading to reproductive maturity is known as adolescence.
Question 489 :
Hormones are secretions of endocrine glands which pour them directly into the ______.
Question 492 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d097f59b460d7261f322.PNG' />
In the above figures, observe the chart and graph given carefully and answer the following questions. There is a difference between the pattern of increase in the height of boys and girls, is it true for each individual?
Question 493 :
Structures present in a cell which is responsible for determination of the sex of a baby is _____.
Question 494 :
The rate of growth in height varies in different individuals. TRUE or FALSE?
Question 499 :
AIDS can spread from an infected person to another person through _____.
Question 500 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0eef59b460d7261f390.png' />
From the above image, fill in the crossword puzzle using the following hint: Male hormone
Question 502 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0ebf59b460d7261f38c.png' />
From the above image, fill in the crossword puzzle using the following hint: Secretion of endocrine glands
Question 503 :
A girl becomes pregnant if she looks at boys during menstruation. Is this a myth?
Question 504 :
The period of life, when the body undergoes changes, leading to reproductive maturity is known as ___________.
Question 505 :
Out of the following, which is the correct match for Female hormone
Question 507 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d09af59b460d7261f326.PNG' />
In the above figure, fill the blank circles and identify the sex of child A.
Question 508 :
Insufficient production of __________ in the tadpoles leads to their incomplete development.
Question 509 :
Adolescence lasts upto 18 or 19 years of age. TRUE or FALSE?
Question 510 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0edf59b460d7261f38e.png' />
From the above image, fill in the crossword puzzle using the following hint: Female hormone
Question 511 :
Sex of the unborn child depends on whether the zygote has XX or XY chromosomes. TRUE or FALSE?
Question 513 :
What is the term used for secretions of endocrine glands responsible for changes taking place in the body?
Question 515 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d094f59b460d7261f320.PNG' />
In the above figure mark the positions of the endocrine glands which release the hormones that controls the release of sex hormones.
Question 516 :
The _________ well being of an individual is regarded as an individual’s health.
Question 518 :
State true or false. Term or changes at adolescence is puberty.
Question 519 :
State true or false. Sex hormones are chemical substances produced by sex organs.
Question 521 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0f2f59b460d7261f394.png' />
From the above image, fill in the crossword puzzle using the following hint: Changes at adolescence constitute
Question 522 :
The change in the body parts indicate that one is no longer a child but on the way to becoming an adult. TRUE or FALSE?
Question 523 :
One ovum matures and is released by one of the ovaries once in about ______.
Question 525 :
Bacterial or other infection may occur if we don't wash our body properly. TRUE or FALSE?
Question 526 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d092f59b460d7261f31d.PNG' />
In the above figure mark the positions of the endocrine glands which release the hormones that maintains the correct salt balance in the blood.
Question 528 :
Upon crossing which age, there is a sudden spurt in growth which becomes noticeable ?
Question 529 :
For the metamorphosis of tadpoles which of the following elements must be available in water?
Question 530 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08df59b460d7261f316.JPG' />
From the above image find out what happens to the sugar solution in A?
Question 531 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d088f59b460d7261f30f.JPG' />
Observe the above image and name the causative agent of this disease.
Question 533 :
The disease caused by a protozoan and spread by an insect is
Question 535 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08bf59b460d7261f313.JPG' />
From the above figure complete the following cycle , By filling the blank (b)
Question 539 :
Pathogenic micro-organisms present in host cells are killed by medicines called
Question 542 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d087f59b460d7261f30e.JPG' />
Observe the image and write the name of the disease
Question 547 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08cf59b460d7261f315.JPG' />
From the above figure complete the following cycle , By filling the blank (d)
Question 548 :
Paheli dug two pits, A and B, in her garden. In pit A, she put a polythene bag packed with some agricultural waste. In pit B, she dumped the same kind of waste but without packing it in a polythene bag. She, then covered both the pits with soil. What did she observe after a month?
Question 549 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d088f59b460d7261f30f.JPG' />
Observe the above image and name the causative agent of this disease.
Question 550 :
Suggest a suitable word for the following statement. Agent which spreads pathogens from one place to another.
Question 552 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08ef59b460d7261f318.JPG' />
From the above image find out what changes will you observe in B when the released gas passes through it
Question 557 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08df59b460d7261f316.JPG' />
From the above image find out what happens to the sugar solution in A?
Question 562 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d087f59b460d7261f30e.JPG' />
Observe the image and write the name of the disease
Question 566 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08cf59b460d7261f314.JPG' />
From the above figure complete the following cycle , By filling the blank (c)
Question 568 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d087f59b460d7261f30d.JPG' />
From the above image find out whether the microorganism grow well in dry or in moist conditions.
Question 570 :
Suggest a suitable word for the following statement. Nitrogen-fixing microorganism present in the root nodules of legumes.
Question 571 :
Unscramble the jumbled words underlined in the following statement.Yeasts are used in the wine industry because of their property of $\underline {meronettinaf}$ .
Question 572 :
Suggest a suitable word for the following statement. Nitrogen-fixing microorganism present in the root nodules of legumes.
Question 573 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d086f59b460d7261f30c.JPG' />
From the above image name the food item on which the organism lives.
Question 574 :
The disease caused by a protozoan and spread by an insect is
Question 575 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d089f59b460d7261f310.JPG' />
Observe the above image and find out how does the disease spread from one plant to another.
Question 576 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08af59b460d7261f312.JPG' />
From the above figure complete the following cycle , By filling the blank (a)
Question 577 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08af59b460d7261f312.JPG' />
From the above figure complete the following cycle , By filling the blank (a)
Question 579 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08ef59b460d7261f318.JPG' />
From the above image find out what changes will you observe in B when the released gas passes through it
Question 583 :
The life cycle of the silkworm consists: egg → _______→ pupa → adult
Question 584 :
The embryo gets embedded in the wall of the ___________ for further development, in Fertilisation.
Question 585 :
After fertilisation, the resulting cell which gives rise to a new
individual is the
Question 586 :
Sets of reproductive terms are given below. Choose the set that has an incorrect combination.
Question 587 :
Aquatic animals in which fertilisation occurs in water are said to be
Question 589 :
Which of the following statements about reproduction in humans is correct?
Question 592 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0a8f59b460d7261f32f.PNG' />
In the above image, identify the process.
Question 593 :
The female reproductive organs are a pair of ovaries, _________ and the uterus
Question 594 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0a6f59b460d7261f32c.PNG' />
In the above image, what is A?
Question 597 :
A tadpole develops into an adult frog by the process of___________
Question 599 :
In humans, the development of fertilised egg takes place in the
Question 600 :
Mother gives birth to a baby but the baby has characters of both parents. How is this possible?
Question 602 :
In human beings, after fertilisation, the structure which gets
embedded in the wall of uterus is
Question 603 :
Among human being, cow, dog and hen. Hen is odd one out. Choose the correct reason for this.
Question 607 :
The eggs of fish are covered by hard shells for protection. TRUE or FALSE?
Question 608 :
External fertilisation can occur both in water and on land. TRUE or FALSE?
Question 609 :
Fill in the blanks. Amoeba is a __(a)___ celled organism. It reproduces by _____(b)_____ reproduction. The process of reproduction begins by the division of its ______(c)____ into two. This is followed by the division of its _____(d)______ into two. This type of reproduction is called _____(e)_____ fission.
Question 610 :
Stages in the life cycle of silkworm are given below. Write them in sequential order. Pupa, Silkworm, Egg, Silkmoth.
Question 613 :
Soon after fertilisation, the zygote divides repeatedly and travels down the__________
Question 615 :
State the following statement True or False:-
The transformation of the larva into an adult through drastic changes is called metamorphosis.
Question 616 :
The stage of the embryo in which all the body parts can be identified is called a ______.
Question 619 :
Is the statement correct : Reproduction happens generally in two modes. These are Sexual reproduction and Asexual reproduction. ?
Question 620 :
In Fertilisation , the zygote divides repeatedly to give rise to a ball of cells and further develops into ________.
Question 621 :
The term used for bulges observed on the sides of the body of hydra is called _______
Question 622 :
In markets, eggs of birds are available but never eggs of dogs. Why?
Question 627 :
Human egg has a head, middle piece and tail. TRUE or FALSE?
Question 629 :
In adult human females, a single mature egg is released into an oviduct every month. TRUE or FALSE?
Question 630 :
The sun’s heat is allowed to get in but is not allowed to go out. The trapped heat warms the _______.
Question 631 :
The Supreme Court has ordered industries to switch to cleaner fuels like -
Question 632 :
River which is famous in India and sustains most of the northern central and eastern Indian population-
Question 633 :
Lakhs of trees are planted every year in July. This event is called as-
Question 634 :
Boojho wishes to contribute in reducing air pollution. Which vehicle should he use for going to school?
Question 637 :
Which method is a commonly used chemical method for purifying water?
Question 638 :
The average temperature of the earth’s atmosphere is gradually increasing. What is it called?
Question 639 :
The trapping of radiations by the earth’s atmosphere is similar. That is why it is called the -
Question 640 :
The type of pollution which is likely to affect Taj Mahal in Agra to a greater extent is ________.
Question 642 :
Oil refineries, paper factories, textile and sugar mills and chemical factories. How do these industries cause harm to water?
Question 643 :
State True or False.
The Gangotri glacier in the Himalayas has started melting because of global warming.
Question 644 :
In the following statements, the words in inverted commas are jumbled up. Write them in their correct form. Vehicles produce high level of pollutants like carbon dioxide, nitrogen oxides, 'nobrac moondexi' and 'mosek'.
Question 645 :
Water contaminated with sewage may contain bacteria, viruses, fungi and parasites which cause diseases like-
Question 648 :
State True or False.
It is not only living organisms that get affected by polluted air but non-living things like buildings, monuments and statues also get affected.
Question 649 :
The pollutants in _______ are discolouring the white marble of Taj Mahal
Question 651 :
Excess of which of the following gas in the air is responsible for this green house effect
Question 652 :
Which gas is produced by combustion of fuels like coal in power plants and can cause respiratory problems?
Question 653 :
State True or False.
The towns and cities, through which the Ganga river flows, throw large quantities of garbage, untreated sewage, dead bodies, and many other harmful things, directly into the river
Question 654 :
Which ambitious plan to save the Ganga river was launched in 1985?
Question 655 :
A pond contains clean water. Which of the following activities will produce least pollution of water?
Question 656 :
Incomplete combustion of fuel such as petrol and diesel gives ______.
Question 657 :
Acid rain corroding the marble of the monument is called _____
Question 658 :
Smoke may contain ______ which combine with other air pollutants and fog to form smog.
Question 659 :
The soil is affected by impure water which causes changes like -
Question 660 :
State True or False.
We can survive for some time without air but we cannot survive even for a few minutes without food.
Question 661 :
The bacteria present in the faeces of mammals are indicators of
Question 663 :
State True or False.
The sources of air pollutants are factories, power plants, automobile exhausts and burning of firewood and dung cakes.
Question 664 :
Deforestation leads to _______ in the amount of $CO_{2}$ in the air because the number of trees which consume $CO_{2}$ is ______
Question 667 :
The Ganga at which part in Uttar Pradesh (U.P.), has one of the most polluted stretches of the river?
Question 668 :
The excessive quantities of chemicals released in water acts as nutrients for the growth of which organism?
Question 669 :
$CO_{2}$ traps heat and does not allow it to escape into ______
Question 670 :
Which processes in the sewage treatment plants help to clean water before discharging it into water bodies?
Question 671 :
CFCs damage the _____ layer of the atmosphere that protects us from harmful ultraviolet rays of the sun.
Question 674 :
Water is becoming scarce due to increase in which of the following activities?
Question 678 :
State True or False.
The increasing population and industrialisation have damaged this mighty river beyond repair.
