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STD 12 - 8. microbes in human welfare — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 8. microbes in human welfare1 Mark
MCQ
Azolla is used as a biofertilizer because it
  • A
    Multiplies very fast to produce massive biomass
  • B
    Has association of nitrogen-fixing Rhizobium
  • ✓
    Has association of nitrogen-fixing cyanobacteria
  • D
    Has association of mycorrhiza
✓

Answer

Correct option: C.
Has association of nitrogen-fixing cyanobacteria
c
The leaves of Azolla (fern) have as many as $80,000$ blue-green algae belonging to Anabaena azollae, which have the capacity to fix atmospheric nitrogen and make it available to Azolla. Azollapinnata is an excellent biofertilizer for rice. Farmers may have reported $50\, \%$ increase in yield of rice by using this biofertilizer.

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