Assertion :In diplontic life cycle, gametophyte is dominant. Reason: In diplontic life cycle, there is no free living sporophyte.

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 D Both Assertion and Reason are incorrect
In a diplontic life cycle, the diploid sporophyte Is the dominant, photosynthetic and independent phase of the plant. The gametophyte is highly reduced and is retained within sporangia.
So the correct option is D.

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