Which of the following is not useful as a bio | vedclass

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(D) Biofertilizers are organisms that enrich the nutrient quality of the soil. $1$. $Glomus$ is a fungal symbiont (mycorrhiza) that helps in phosphoru

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Snail

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(D) Biofertilizers are organisms that enrich the nutrient quality of the soil. $1$. $Glomus$ is a fungal symbiont (mycorrhiza) that helps in phosphorus absorption. $2$. Earthworms are known as 'farmers' friends' because they improve soil aeration and fertility through vermicomposting. $3$. $Oscillatoria$ is a cyanobacterium that fixes atmospheric nitrogen. $4$. Snails are mollusks that do not contribute to soil fertility as biofertilizers; in fact,they are often considered pests in agricultural fields. Therefore,the correct option is $D$.

Which of the following is not useful as a biofertilizer?

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