Question

explain the role of rhizobium, Azospirillum and Anabaena as biofertilisers​

Answer 1

Answer:

Biofertilizers are classified as: Free-living nitrogen-fixing bacteria like Azotobacter, and Rhodospirillum. Free-living nitrogen-fixing Cyanobacteria like Anabaena, and Nostoc. Loose association of nitrogen-fixing bacteria like Azospirillum.

Explanation:

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Answer 2

The role of rhizobium, Azospirillum and Anabaena as biofertilisers are as follows:-

Rhizobium: Rhizobium helps to form root nodules in leguminous plants. It also helps to fix atmospheric nitrogen and convert into its organic form. Rhizobium doesn't have any negative effect on soil quality and it helps to improve the quality as well as nutrient content of plants. It contributes to the growth of plants.

Azospirillum: Azospirillum is used in wetland areas. It is present inside the roots of the plant and it can fix the atmospheric nitrogen.

Anabaena: Anabaena have special types of cells which are known as heterocysts. These specialised cells provide sites for N2 fixation as they possess nitrogenase enzymes which help in nitrogen fixation. Anabaena is a type of algae present in the Azolla plant. It is used in the paddy fields for enhancing or increasing the nitrogen content of the soil and thus increasing the yield of rice crops.