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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Botany
Chapter
Mineral Nutrition

NTA Abhyas 2020 · Botany · Mineral Nutrition

Which of the following species does not have the ability to fix...

Which of the following species does not have the ability to fix atmospheric nitrogen?

Options

  1. ANostoc
  2. BSpirogyra
  3. CAzotobacter
  4. DAnabaena

Correct answer

B. Spirogyra

Step-by-step solution

Nitrogen fixation is carried by prokaryotic cells, bacteria and cyanobacteria having Nif gene. Nif gene produces an enzyme nitrogenase which carries out nitrogen fixation. Spirogyra is a green algae that lacks nif gene thus cannot carry out nitrogen fixation.
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