Question

Which one of the following can be used as biofertilizers in the cotton field?
a) Azolla- anabaena
b) Streptococcus
c)Azospirillum
d)Azotobacter chroocoocurn

Answer 1

Hint Biofertilizers are the fertilizers that contain live microorganisms in them. When they are applied to the seeds, plant surfaces, or soil they colonize and then help the plant in its development and growth by providing it with necessary nutrients from the soil.

Complete answer:
The biofertilizer used in the cotton field is Azotobacter chroocoocurn. It is used for fixing the atmospheric nitrogen into the soil and helps in improving the nitrogen content of the soil. The chemical fertilizers used usually cause different types of pollution including the water pollution which affects the organisms living in the water. So, to avoid such conditions the biofertilizers were introduced in order to have sustainable crop production. Through the use of biofertilizers, the optimum plant growth and development and higher productivity of the plants can be reached easily without compromising the health of the other organisms. As the increased use of chemical fertilizers causes a decline in the soil quality and fertility, the use of biofertilizer ensures that the quality of soil is maintained and an ample amount of nutrients are available in the soil for good production of the crop. The biofertilizers are also used to increase the nitrogen content in the soil by the addition of the nitrogen-fixing bacteria in the soil.

So, the answer is ‘Azotobacter chroocoocurn’.

Note: The use of the biofertilizers is an eco-friendly way of crop production. Biofertilizers can improve soil quality, plant growth, and development. They are also used for the fixing of atmospheric nitrogen into the soil as in cotton plants.