Question 2 :
In leaves, name the cell organelle that is responsible for green colour
Question 5 :
The unit of measurement used for expressing dimension (size) of cells is
Question 7 :
An organism with billions of cells begins life as ______ which is the fertilised egg.
Question 8 :
What is the central dense round body in the centre of the cell called?
Question 9 :
What is the size of the smallest cell in case of bacteria?
Question 12 :
Balanced diet is required to maintain a good health. TRUE or FALSE?
Question 13 :
Out of the following, which is the correct match for Secretion of endocrine glands
Question 17 :
One ovum matures and is released by one of the ovaries once in about ______.
Question 18 :
Which of the following changes is/are observed in girls during adolescence?
Question 19 :
Give a suitable word for the following statement. Chemicals which control changes at adolescence stage.
Question 21 :
The property of metals by virtue of which they can be drawn into wires is called ductility. True or False
Question 22 :
Litmus indicator solution turns red in acidic solutions and blue in alkaline solutions?
Question 23 :
Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is a nonmetal?
Question 26 :
The name of the product formed in the reaction of sulphur and _____________ is sulphur dioxide gas.
Question 27 :
A metal which reacts with acid as well as base to form hydrogen gas.
Question 28 :
Generally, metals are malleable and ductile. Non-metals do not have these properties.
Question 29 :
A more reactive metal can replace a less reactive metal, but a less reactive one cannot replace a more reactive metal. TRUE/FALSE
Question 31 :
Which part of our body vibrate when we hear a sound?
Question 32 :
Which of the following voices is likely to have minimum frequency?
Question 33 :
How can we recognize many familiar sounds without seeing the objects producing them?
Question 34 :
Lightning and thunder take place in the sky at the same and at the same distance from us. Lightning is seen earlier and thunder is heard later. Can you explain why?
Question 37 :
The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration?
Question 41 :
State TRUE or FALSE: Cells are the basic structural units of living organisms.
Question 42 :
State TRUE or FALSE: Chromosomes play an important role in the inheritance of characters.
Question 44 :
State TRUE or FALSE: Chromosomes carry genes that help in the transfer of characters from parents to the offspring.
Question 47 :
State TRUE or FALSE: Chloroplasts are found in both plant and animal cells.
Question 48 :
Indicate whether the following statement is True (T) or False (F): Amoeba has an irregular shape.
Question 49 :
Indicate whether the following statement is True (T) or False (F): Unicellular organisms have one-celled body.
Question 50 :
___________ separates the contents of the cell from the surrounding medium.