which of the following is not bio fertilizer
a-Azotobacter
b-Bacillus thuringiensis
c-Clostridium
d-Azolla
Answers
Correct answer: B) Bacillus thuringiensis
Bio-fertilizers can be defined as the preparations which contains latent cells or living cells of microorganisms that help plants to take nutrients by their interaction when they are applied through the soil or seed.
Bio-fertilizers contain selected strains of microorganism that is cultivated in lab for particular use. Some of them help to increase the level of nutrients like nitrogen, phosphorus in the soil, while other help to fight against disease.
Bio-fertilizers such as Azotobacter, Rhizobium, Blue Green Algae, Clostridium and Azospirilium is used since a long time.
Bacillus thuringiensis is a soil borne bacteria which is used as a pesticide. It contains a spore in which a protein crystal is found which is toxic and is used to kill pest.