Previous year MCQs

General science UPPSC 2022 GS-I
Question

Given below are two statements one is labelled as Assertion (A) and the other as Reason (R).

Assertion (A): Phytoplankton grow in abundance in the limnetic zone.
Reason (R): Limnetic zone is open water zone.

Select the correct answer from the code given below:
Code:

Answer & Solution

Answer: (Detailed Solution Below)

Option D: Both (A) and (R) are true and (R) is the correct explanation of (A)

Detailed Solution:

The correct answer is “Both (A) and (R) are true and (R) is the correct explanation of (A)”.
Phytoplankton grow in abundance in the limnetic zone. The limnetic zone is the well-lit, open surface waters in a lake where sunlight can penetrate, supporting the growth of phytoplankton.
Assertion (A) is true. The limnetic zone is indeed known for high productivity, particularly in phytoplankton, due to the availability of sunlight and nutrients in this zone of freshwater bodies.

Reason (R) is also true. The limnetic zone refers to the well-lit, open surface waters of a lake or pond that are far from the shore.

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