Assertion :Nitrogen fixing enzyme in legume root nodules function at low oxygen concentration. Reason: Low oxygen concentration is provided by leghaemoglobin.

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
Nitrogenase is very sensitive to oxygen. The nodule has adaptations that ensure that the enzyme is protected from oxygen.
To protect these enzymes, the nodule contains an oxygen scavenger called leg-hemoglobin.

So the correct option is "Both Assertion and reason are correct and the reason is the correct explanation for the assertion".

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