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Question

Leguminous plants are able to fix atmospheric nitrogen through symbiotic activity. Which is not correct?

A
Leghaemoglobin scavenges oxygen and is pinkish in colour.
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B
Nitrogenase is insensitive to oxygen.
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C
Nodules act as sites for nitrogen fixation.
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D
The enzyme nitrogenase catalyses the conversion of atmospheric nitrogen to ammonia.
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Solution

The correct option is B Nitrogenase is insensitive to oxygen.
The enzyme nitrogenase is highly sensitive to the molecular oxygen; it requires anaerobic conditions. The nodules have adaptations that ensure that the enzyme is protected from oxygen.

So the correct option is "nitrogenase is insensitive to oxygen".

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