Fertility of the soil in rice fields can be improved by

Chlamydomonas

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Sodium chloride

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Anabaena

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Rhizopus

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Solution

The correct option is C
Anabaena

Azolla is a floating pteridophyte, which contains as endosymbiont the nitrogen-fixing cyanobacteriumAnabaena azollae. Azolla is either incorporated into the soil before rice transplanting or grown as a dual crop along with rice.

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