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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
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
Rhizobium species live in symbiotic association in the root nodules of leguminous plants. In the soil, the bacteria cannot fix nitrogen. After entering the legume root, the bacterium induces cell membrane. A pink-red pigment called leghaemoglobin lines the membrane and the protects the bacteria from the oxygen.

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