Question

Biofertilisers are:

• A. Some bacteria and cyanobacteria
• B. Fertilisers formed by ploughing in barseem
• C. Fertilisers obtained by decay of dead organisms
• D. Fertilisers prepared by mixing cattle dung with crop residues

Answer 1

The correct option is A Some bacteria and cyanobacteria

A biofertilizer is a substance that contains living microorganisms (like some bacteria and cyanobacteria) which, when applied to the soil, helps in the growth of the plant by increasing the supply of primary nutrients to the host plant.

So, the correct option is 'some bacteria and cyanobacteria'.