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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The pyramid of biomass in a sea is generally inverted. Reason (R): The biomass of fishes far exceeds that of phytoplankton. In the light of the above statements, choose the correct answer from the options given below:

Options

  1. AAssertion (A) is false but Reason (R) is true.
  2. BAssertion (A) is true but Reason (R) is false.
  3. CBoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
  4. DBoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

Correct answer

D. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

Step-by-step solution

According to NCERT, the pyramid of biomass in a sea is generally inverted. This is because a small standing crop of phytoplankton supports a much larger standing crop of zooplankton and fishes, meaning the biomass of fishes far exceeds that of phytoplankton. Therefore, both the Assertion and the Reason are true, and the Reason correctly explains the Assertion. Answer: Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

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