Oxygen is harmful for:

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(A) Nitrogen-fixing bacteria,such as $Rhizobium$ and $Azotobacter$,possess an enzyme called nitrogenase which is responsible for the fixation of atmos

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Nitrogen fixing bacteria

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(A) Nitrogen-fixing bacteria,such as $Rhizobium$ and $Azotobacter$,possess an enzyme called nitrogenase which is responsible for the fixation of atmospheric nitrogen into ammonia. This enzyme is highly sensitive to oxygen and is irreversibly inactivated by it. Therefore,these bacteria require an anaerobic (oxygen-free) environment to function effectively. In contrast,ferns,$Chara$ (an algae),and mango trees are aerobic organisms that require oxygen for cellular respiration.

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