Some blue – green algae can be used as biofertilizer as they are

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secreting some chemicals that prevent the growth of any other plants near it.

rich in toxic alkaloids.

growing every where.

capable of fixing nitrogen.

answer is D.

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Detailed Solution

Cyanobacteria contains heterocyst and are capable of fixing nitrogen. So they can enrich the soil with nitrogen and hence it is used as a biofertilizer.

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