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Solution


Q.

Select the correct statements regarding dissolved oxygen and Biochemical Oxygen Demand.                 [2023]
(A) BOD is inversely related to dissolved oxygen.
(B) Low dissolved oxygen and high BOD lead to loss of aquatic life.
(C) High BOD leads to high dissolved oxygen.
(D) Both BOD and dissolved oxygen are indicators of health of a water body.
(E) Both BOD and dissolved oxygen are affected by amount of organic matter in the water body.

Choose the most appropriate answer from the options given below.
1 (A), (B), (C), (E) only  
2 (A), (B), (D), (E) only  
3 (A), (B), (C), (D) only  
4 (B), (C), (D), (E) only  

Ans.

(2)

High BOD means high amount of organic matter in water. The more the BOD, the lesser will be the dissolved oxygen, as it gets used up.