Which of the following are correct examples of biofertilizers?
I. Mycorrhizal fungi
II. Blue-green algae
III. Bacillus thuringiensis
- AOnly I
- BI and II only
- COnly II
- DIII only
- ENone of the above/More than one of the above
Show answer and explanation
Correct answer: (b) I and II only
Explanation
Mycorrhizal fungi and blue-green algae (cyanobacteria) are biofertilisers: they improve the plant's supply of nutrients.
Bacillus thuringiensis is a bacterium used for pest control; its gene gives Bt cotton its resistance to insects. So only I and II are correct.