Q44 of 54 Page 351

One of the following does not contribute in producing acid rain. This one is:

The air pollutants such as Sulphur dioxide and nitrogen dioxide which reacts with water vapors in the atmosphere to form sulphuric acid and nitric acid. These acids combine with rain and makes the rain water acidic. This is called Acid rain.

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42

Which of the following is not an air pollutant?

 43

Which of the following air pollutant is capable of preventing photosynthesis in plants?

 45

Which of the following will reach the earth in greater amounts if the number of chlorofluorocarbons released into the air increases?

 46

The farmers use large amounts of a substance P in the fields to increase the crop yield. The excess of P dissolves in water and runs into a lake. The substance P causes rapid growth of tiny green water plants Q in the lake which cover the whole lake like a green sheet. When the plants Q die, the organisms called R decompose them by utilizing S dissolved in lake water. The amount of dissolved Sin water decreases too much due to which the fish living in lake suffocate and die. What are P, Q, R and S?