Some blue – green algae can be used as biofertilizer as they are
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a
secreting some chemicals that prevent the growth of any other plants near it.
b
rich in toxic alkaloids.
c
growing every where.
d
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.