Assertion :Maximum contribution of oxygen is from phytoplanktons. Reason: 50% of the photosynthesis with oxygen evolution is contributed by them.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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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 are the autotrophic components of an ecosystems. Like land plants, phytoplankton have chlorophyll to capture sunlight, and they use photosynthesis to turn it into chemical energy. They consume carbon dioxide, and release oxygen.
All phytoplankton photosynthesize. Through photosynthesis, phytoplankton consume carbon dioxide on a scale equivalent to forests and other land plants. 50% of photosynthesis where oxygen is evolved is contributed by phytoplankton. Thus, the correct answer is option A.

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