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Question
An aquatic fern which is an excellent biofertiliser is ___.
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Solution
The correct option is A Azolla
Azolla is a floating pteridophyte, which contains as endosymbiont - the nitrogen-fixing cyanobacterium Anabaena azollae. Azolla is generally used as a source of nitrogen for the cultivation of rice in certain regions of asia. It is either incorporated into the soil as biofertiliser before the transplantation of rice or it is grown as a dual crop along with rice.
Azolla is a floating pteridophyte, which contains as endosymbiont - the nitrogen-fixing cyanobacterium Anabaena azollae. Azolla is generally used as a source of nitrogen for the cultivation of rice in certain regions of asia. It is either incorporated into the soil as biofertiliser before the transplantation of rice or it is grown as a dual crop along with rice.
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