Multiple choice

Directions: The following items consist of two statements, one labelled as 'Assertion (A)' and the other labelled as 'Reason (R)'. You are to examine these two statements carefully and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the reason is a correct explanation of the Assertion. Select your answer to these items using the codes given below. Assertion (A) : In oligotrophic lakes, high concentration of nutrients result in algae blooms. Reason (R) : A higher concentration of nutrients result in higher organic productivity.

  1. Both A and R are true and R is the correct explanation of A.

  2. Both A and R are correct but R is not the correct explanation of A.

  3. A is true but R is false.

  4. A is false but R is true.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The assertion is incorrect - oligotrophic lakes are characterized by LOW nutrient concentrations, not high. These are clear, oxygen-rich lakes with low biological productivity. Eutrophic lakes, not oligotrophic, have high nutrients leading to algae blooms. The reason correctly states that higher nutrients increase productivity, but oligotrophic lakes are nutrient-poor by definition.

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