Question

Assertion :Eutrophication shows increase in productivity in water. Reason: With increasing eutrophication, the diversity of the phytoplankton increases.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
• C. Assertion is correct but Reason is incorrect.
• D. Assertion is incorrect but Reason is correct.

Answer 1

The correct option is C Assertion is correct but Reason is incorrect.

Eutrophication is a condition where the excessive richness in the environment leads to overgrowth of the plants in the water bodies. As the lakes fertility increases, algal bloom occurs. Algal bloom causes the deterioration of water quality and fish mortality and dead remains begin to be deposited on the lake bottom. Over the year, the lake is finally converted into the land. In eutrophication, a single species grows enormously which leads to decrease in biodiversity. Thus, the correct answer is option B.