Which of the following is a biofertilizer?

A. Green algae

B. FYM

C. Compost

D. All of these

Answer: Option A

Solution(By Examveda Team)

Green alga is a biofertilizer.
Blue-green algae (BGA) are an easily available and economically cheap resource material for production and use as biofertilizers.
These are free-living, photoautotrophic micro-organisms, many of which also fix atmospheric nitrogen and are found in abundance in rice fields.