Assertion :Azolla is used as a biofertilizer in rice fields. Reason: Azolla contains nitrogen fixing cyanobacteria in its leaf cavities.

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.
Azolla is a floating pteridophyte that is used as a biofertilizer in the rice fields. It is incorporated into the soil before the rice plantation or planted as dual plantation along with the rice plants. This is used as the biofertilizer as it contains a nitrogen-fixing bacteria Anabaena azollae. Hence, the reason is the correct explanation for the assertion.

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