Question 1 :
This chemical protects our crops and is washed into water bodies from the field-
Question 2 :
In the following statements, the words in inverted commas are jumbled up. Write them in their correct form. Air contains 78% 'ginroten' and 21% 'gonexy'.
Question 4 :
In the following statements, the words in inverted commas are jumbled up. Write them in their correct form. Carbon dioxide, 'thaneme', nitrous oxide and water vapour are known as 'heengrouse sesga'.
Question 8 :
_________ is produced from incomplete burning of fuels such as petrol and diesel.
Question 9 :
By volume, about __% of the air mixture is nitrogen and about __% is oxygen.
Question 11 :
Combustion of fossil fuels generates a lot of air pollution. Can you suggest any two alternative sources of energy which do not cause any pollution?
Question 13 :
Which part of the Indian population does Ganga river sustains the most?
Question 14 :
Gases like methane, nitrous oxide contribute towards rising temperature of earth's atmosphere. What are they called?
Question 15 :
The pollutants in _______ are discolouring the white marble of Taj Mahal
Question 16 :
The type of pollution which is likely to affect Taj Mahal in Agra to a greater extent is ________.
Question 17 :
State True or False.
We can survive for some time without air but we cannot survive even for a few minutes without food.
Question 20 :
Smoke may contain ______ which combine with other air pollutants and fog to form smog.
Question 22 :
The smog causes breathing difficulties such as _____ , ______and ______ in children.
Question 23 :
The Supreme Court has ordered industries to switch to cleaner fuels like -
Question 25 :
State True or False.
Water which is suitable for drinking is called soft water.
Question 26 :
Is there a need to switch over to alternative fuels instead of the fossil fuels for our energy requirements, like solar energy, hydropower and wind energy?
Question 27 :
Which gas is produced by combustion of fuels like coal in power plants and can cause respiratory problems?
Question 28 :
Boojho wishes to contribute in reducing air pollution. Which vehicle should he use for going to school?
Question 29 :
A lot of oxygen in the water body gets used up. This results in a decrease in the oxygen level which may kill-
Question 30 :
Deforestation leads to _______ in the amount of $CO_{2}$ in the air because the number of trees which consume $CO_{2}$ is ______
Question 31 :
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 34 :
Which of the following procedures will give you water free from all impurities?
Question 36 :
Lakhs of trees are planted every year in July. This event is called as-
Question 37 :
State True or False.
The sources of air pollutants are factories, power plants, automobile exhausts and burning of firewood and dung cakes.
Question 39 :
State True or False.
The Gangotri glacier in the Himalayas has started melting because of global warming.
Question 43 :
Acid rain corroding the marble of the monument is called _____
Question 45 :
The trapping of radiations by the earth’s atmosphere is similar. That is why it is called the -
Question 46 :
The average temperature of the earth’s atmosphere is gradually increasing. What is it called?
Question 47 :
State True or False.
Carbon monoxide is produced by complete burning of fuels such as coal, petrol, diesel.
Question 49 :
The soil is affected by impure water which causes changes like -
Question 50 :
Once the algae in water die, they serve as a food for decomposers like -
