Assertion :Azolla is used as biofertilizer in rice fields. Reason: Azolla contains nitrogen fixing cyanobacteria in its root nodules.

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 C Assertion is correct but Reason is incorrect.
Azolla is used as biofertilizer due to it's symbiosis with cyanobacteria Anabaena for nitrogen fixation,in it's leaves.
Correct answer-C

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Assertion :Azolla is used as biofertilizer in rice fields. Reason: Azolla contains nitrogen fixing cyanobacteria in its root nodules.

The correct option is C Assertion is correct but Reason is incorrect.Azolla is used as biofertilizer due to it's symbiosis with cyanobacteria Anabaena for nitrogen fixation,in it's leaves.Correct answer-C

The correct option is C Assertion is correct but Reason is incorrect.
Azolla is used as biofertilizer due to it's symbiosis with cyanobacteria Anabaena for nitrogen fixation,in it's leaves.
Correct answer-C