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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:

1. Both Statement I and Statement II are true
2. Both Statement I and Statement II are false
3. Statement I is true but Statement II is false
4. Statement I is false but Statement II is true

Correct answer: Both Statement I and Statement II are false

Solution

Statement I is incorrect because polluted water typically has low dissolved oxygen and high BOD, not both low. Statement II is also false because eutrophication initially increases oxygen levels due to algal blooms, but can later lead to oxygen depletion as the algae die and decompose.

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