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Q.

Which of the following is not correct w.r.t symbiotic nitrogen fixation in legume plants?

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a

The enzyme nitrogenase is highly sensitive to the molecular oxygen

b

Bacteria such as Nostoc and Azotobacter forms the nodules in legumes

c

Nodule contains an oxygen scavenger called leg-haemoglobin

d

Division and growth of cortical and pericycle cells lead to nodule formation

answer is B.

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Detailed Solution

Nostoc and Azotobacter are free living nitrogen fixing bacteria. Nostoc, though symbiotic in some cases does not form root nodules.
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Which of the following is not correct w.r.t symbiotic nitrogen fixation in legume plants?