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Plant Kingdom — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYPlant Kingdom2 Marks
Question
Which pteridophytes are useful in nitrogen-fixation and how?
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Answer

Azolla is a water fern, having a symbiotic association with nitrogen-fixing cyanobacterium Anabaena. It is introduced into paddy fields to function as biofertiliser.

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