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Question

Assertion :Nitrogen-fixing bacteria in legume root nodules survive in oxygen-depleted cells of nodules. Reason: Leghaemoglobin completely removes oxygen from the nodule cells.


A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Leguminous plants have root nodules, which harbour nitrogen fixing bacteria Rhizobium. The nitrogen fixing enzyme in Rhizobium, i.e., nitrogenase is highly sensitive to free oxygen. 
The red (or pink) pigment leghemoglobin present in root nodules, acts as scavenger of free oxygen and binds free oxygen.

Biology

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