Blue green algae used in rice fields to increase fertility is

Rivularia

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Nostoc

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Aulosira

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Anabaena

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Solution

The correct option is C Aulosira
Blue Green Algae (BGA) is a good alternative source of nitrogen in rice fields to increase the soil fertility. Various BGA like Nostoc, Anabaena, Aulosira Scytonema are used to increase rice production. Out of all these, Aulosira fertilissima are most commonly used in rice fields.
Thus, the correct answer is 'Aulosira.'

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Question 1 (b)
Blue green algae fix ___ directly from air to enhance fertility of soil.

Question 1 (b)
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