What are biofertilizers? Discuss the role of symbiotic `N_2` fixation by a bacterium and a cyanobacterium.

Name two symbiotic N_2 -fixing microbes.

Write short notes on: Mycorrhiza Symbiotic N_2 fixation.

What are auxins?Discuss the role of auxins in the growth of plants.

Discuss the role of Microbes as biofertilizers.

What is leghaemoglobin? Give its role in N_2 fixation.

What are biofertilizers? Name two organism which fix nitrogen asymbiotically and two organisms with fix symbiotically.

An anaerobic bacterium capable of atmospheric N_2 -fixation is :