40. Biofertilizers and Biofuels

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1.
The mosquito fern or Azolla is used as a biofertiliser because it__:
2.
Fertility of soil can be improved by which of the following methods?
3.
Which among the following branches of science deals with the scientific study of interaction of soils with vegetative matter?
4.
Which among the following is not a bio-fertilizer?
5.
Which among the bio fertilizer uses earthworm?
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