give reasons :

(a) survival of fish and other aquatic animals become difficult during summers ?

(b) when a beam of light is thrown on a clear solution of copper sulphate kept in a dark room, it does not glow.

Due to paucity of time it would not be possible for us to solve all your queries. We are providing solution to one of your queries. Try solving the rest of the questions yourself and if you face any difficulty then do get back to us.

Answer 1)

As the temperature increases, the levels of dissolved oxygen decreases. Cold water holds more oxygen as compared to warm or hot water. Therefore, during summers survival of fish and other aquatic life is difficult due to less amount of available dissolved oxygen in water. 

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