Which of the following is a biofertilizer?

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(D) Biofertilizers are organisms that enrich the nutrient quality of the soil. $1$. $Anabaena$ and $Azolla$ are classic examples of biofertilizers whe

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All of the above

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(D) Biofertilizers are organisms that enrich the nutrient quality of the soil. $1$. $Anabaena$ and $Azolla$ are classic examples of biofertilizers where $Anabaena$ (a cyanobacterium) lives in the leaf cavities of the fern $Azolla$ and fixes atmospheric nitrogen. $2$. Cow dung and agricultural waste are organic materials that decompose to provide nutrients to the soil,acting as organic fertilizers. $3$. The sludge left in a biogas plant is rich in organic matter and nutrients,which is also used as a fertilizer. Therefore,all the options listed contribute to soil fertility and are considered biofertilizers or organic fertilizers.

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