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Question

Which of the following enzyme fixes nitrogen?
  1. Nitrogenase
  2. Rubisco
  3. PEP carboxylase
  4. Nitrate reductase

A
Nitrate reductase
B
Nitrogenase
C
PEP carboxylase
D
Rubisco
Solution
Verified by Toppr

The correct option is B Nitrogenase
Plants cannot consume atmospheric nitrogen directly. In atmosphere nitrogen is present in stable diatomic form.
Plants absorb nitrogen in the form of nitrates, nitrites and ammonium ions. Nitrogenase is the enzyme used to reduce atmospheric nitrogen by nitrogen fixing bacteria, like Rhizobium. This enzyme is molybdo-flavoprotein and requires molybdenum for activity.

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