Which of the following materials of biological origin are commonly used to maintain and improve soil fertility?

Green manure

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Biofertilizers

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Bioinsecticides

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Both A and B

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Solution

The correct option is C Both A and B
Green manure and biofertilizers maintain and improve soil fertility. Green manure is prepared by the waste leaf from the plants. The waste leaf of the plant is mainly dumped in the soil which is further decomposed by bacteria of the soil.
Biofertilizers are prepared by the strains of microorganism which fix the essential nutrients for the soil.
So, the correct answer is option D.

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