Some blue green algae are used as biofertiliser because they can

Fix nitrogen

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Secrete mucilage

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Perform photosynthesis

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Grow everywhere

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Solution

The correct option is A Fix nitrogen
Biofertilisers are the organisms that enrich soil nutrient quality. Blue green algae for example Nostoc, Anabaena, Oscillatoria are used as biofertilizers because they can fix atmospheric nitrogen into nitrates which can then be used by plants.

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Some blue-green algae can be used as biofertilizers because they are:

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