how do organisms like nostoc and anaebena act as biofertilizers
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because they do N2 fixing
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Blue-green algae or cyanobacteria such as Nostoc, Anabaena, possess specialized cells. These cells are called as heterocysts. These are modified cells which are formed from the vegetative cells. These are the sites for N2 fixation as it contains nitrogenase enzyme which helps in nitrogen fixation.
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