A) Salvinia
B) Mucor
C) Aspergillus
D) Azolla
Correct Answer: D
Solution :
The leaves of Azolla (water fem) contain upto 80,000 Anabaena, which fix atmospheric nitrogen and make it available to Azolla which, in turn, makes it available to soil on decomposition. This is used as a precious green compost for rice cultivation.
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