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.
Nitrogen fixation takes place in the presence of enzyme nitrogenase which is active in anaerobic conditions. This enzyme is present in the root nodules of leguminous plants. A red pigment called leghaemoglobin is present in the cytosol of nodule cells. The pigment leghaemoglobin is similar to haemoglobin of red blood cells. It has the ability to combine very rapidly with with oxygen and thus acts as oxygen scavenger. Thus it helps in maintaining the anaerobic conditions for nitrogen fixation.
Thus, the correct answer is option A.

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