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Mineral Nutrition — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYMineral Nutrition1 Mark
MCQ
Which of these organisms does not help in $N_2$​ fixation?
  • A
    Anabaena
  • B
    Nostoc
  • ✓
    Spirogyra
  • D
    Rhizobium
✓

Answer

Correct option: C.
Spirogyra
Spirogyra is a filamentous green alga.
They are found in freshwater such as pools, ponds, etc.
They have long thin unbranched filaments of cylindrical cells.
They are not involved in nitrogen fixation.
Whereas Anabaena, Nostoc and Rhizobium play a critical role in nitrogen fixation.

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