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Q.
Which of the following is an aquatic fern and an excellent bio-fertilizer?
NTA AbhyasNTA Abhyas 2022
Solution:
Azolla is a freshwater fern harbouring a blue green algae - Anabaena in its leaf cavities. The alga fix atmospheric nitrogen and releases nitrogenous compounds in leaf cavities. This symbiotic system is the main source of algal biofertilizer in rice fields.