Which of the following serve as an important biofertiliser in paddy field?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Oscillatoria
Option (2) Oscillatoria — Correct. Cyanobacteria such as Oscillatoria fix nitrogen in paddy fields.
NCERT Extract:
Microbes as Biofertilisers – “… Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial environments many of which can fix atmospheric nitrogen, e.g. Anabaena, Nostoc, Oscillatoria, etc. In paddy fields, cyanobacteria serve as an important biofertiliser. Blue green algae also add organic matter to the soil and increase its fertility.”