Question

A farmer adds Azotobacter culture to soil before sowing maize which mineral element is being replenished?​

Answer 1

Answer:

Azotobacter is a free living bacteria in the soil. It helps some cereal crops like maize (Zea mays) in nitrogen fixation. The farmer adds Azotobacter culture to the maize field for enhancing the nitrogen element in the soil by the process of biological nitrogen-fixation.

Thus, the correct answer is 'N.

Azotobacter is a genus of usually motile, oval or spherical bacteria that form thick walled cysts, play important role in fixing atmospheric nitrogen, hence increasing fertility of soil by replenishing nitrogen in soil.