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Question

How many organisms In the list given below are N2 fixer autotrophs?
Azotobacter, Chromobum, Azospirillum, Rhodospirillum, Rhizobium, Nitrobacter, Aulosira, Nostoc, Osallatona

  1. Six
  2. Four
  3. Three
  4. Five

A
Three
B
Four
C
Five
D
Six
Solution
Verified by Toppr

Nitrogen-fixing bacteria are capable of fixing atmospheric nitrogen to inorganic substances usable by plants. Example from the given list are Azetobactor, Azospirillum, Rhizobium, Nitrobactor and Nostoc.
So the correct answer is 'five'.

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