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Mineral Nutrition — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYMineral Nutrition1 Mark
MCQ
Which one does not fix nitrogen:
  • A
    Azotobacter
  • ✓
    Spirogyra
  • C
    Anabaena
  • D
    Nostoc
✓

Answer

Correct option: B.
Spirogyra
Azotobacter, Anabaena, Nostoc are the nitrogen fixing prokaryotes in lichens, azolla, Cycas while Spirogyra is a green algae which does photosynthesis. It does not fix nitrogen.

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