Q. 8

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Answer :

Cyanobacteria are prokaryotes that have the ability to fixatmospheric nitrogen with the help of specialised cells called heterocysts. Nostoc and Anabaena are common free- living nitrogen fixers. They have helped to improve agriculture output by:

a. Improving crop yield by serving as bio fertilizer.


b. Increasing fertility by adding organic material to soil.


c. Reducing cost of usage of nitrogen fertilizer.


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