Given below are two statements :
Statement I: In polluted water values of both dissolved oxygen and BOD are very low.
Statement II : Eutrophication results in decrease in the amount of dissolved oxygen.
In the light of the above statements, choose the most appropriate answer from the options given below :
Statement I: In polluted water values of both dissolved oxygen and BOD are very low.
Statement II : Eutrophication results in decrease in the amount of dissolved oxygen.
In the light of the above statements, choose the most appropriate answer from the options given below :
- (A)Both Statement I and Statement II are true
- (B)Both Statement I and Statement II are false
- (C)Statement I is true but Statement II is false
- (D)Statement I is false but Statement II is true✓ Correct
Answer: (D)
Solution
Statement I is false: polluted water has low dissolved oxygen but high BOD (Biological Oxygen Demand), because organic matter and pollutants require oxygen for decomposition. Statement II is true: eutrophication causes excessive growth of aquatic plants and algae, which consume dissolved oxygen, leading to a decrease in oxygen levels. Therefore, Statement I is false but Statement II is true.
JEE Main · 2022 · 28 Jul 2022 · Shift 1 · Single correct option