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Question

Assertion :In a marine aquatic ecosystem, the biomass of phytoplanktons(producers) at any given time, is lower than biomass of zooplanktons (primary consumers). Reason: Phytoplanktons are consumed almost as rapidly as they are formed and this have shorter life spans.

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

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Phytoplankton is the foundation of the aquatic food web. They are the primary producers in marine ecosystem.,
  • In a marine aquatic ecosystem, the biomass of phytoplankton(producers) at any given time, is lower than the biomass of zooplankton (primary consumers) because Phytoplanktons are consumed almost as rapidly as they are formed and thus have shorter life spans.
  • Hence Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
  • So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.

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