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Question

Fertility of  the soil in rice fields can be improved  by


  1. Rhizopus

  2. Sodium chloride

  3. Chlamydomonas             

  4. Anabaena


Solution

The correct option is D

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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