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

Options

A. Assertion is correct, reason is correct, reason is a correct explanation for assertion.
B. Assertion is correct, reason is correct, reason is not a correct explanation for assertion
C. Assertion is correct, reason is incorrect
D. Assertion is incorrect, reason is correct.

Answer

B

Explanation

Eutrophication is a natural process which literally means well nourished orenriched. It is anatural state in many lakes and ponds which have a rich supply of nutrients. Eutrophication becomes excessive, when abnormally high amount of nutrient from sewage, fertilizers, animal wastage and detergent,enter streamsand lakescausing excessive growth or blooms of microorganisms. With increasing eutrophication, the diversity of the phytoplankton community of a lake increases and the lake finally becomes dominated byblue - green algae