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Subject :NSO    Class : Class 8

On the basis of the given graph select the correct statement.

(A) X shows the amount of pollutants present in water.

(B) Y shows the population of fishes and other fresh water organisms.

(C) Y shows the amount of oxygen dissolved in water.

(D) Y shows the population of bacteria and algae.

Ans 1: (Master Answer)

Class : Class 1
The correct answer is D.

Ans 2:

Class : Class 8
X can be the harmful and toxic wastes.so as they are released and again gain concentration,the quantity of aquatic animals decrease.Otherwise it was on an increase as the pollution was discharged.

Ans 3:

Class : Class 9

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