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(D) biogas plant consists of a concrete tank (digester) in which bio-wastes are collected and a slurry of dung is fed.$1$. The concrete tank is filled

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$(ii)$ and $(iv)$

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(D) biogas plant consists of a concrete tank (digester) in which bio-wastes are collected and a slurry of dung is fed.$1$. The concrete tank is filled with a slurry of cow dung and organic waste (agricultural waste,plant residues,etc.).$2$. Methanogens (like $Methanobacterium$) are anaerobic bacteria that grow in this slurry and produce biogas.$3$. Therefore,the primary materials filled into the tank are cow dung and organic waste,which serve as the substrate for the methanogenic bacteria.$4$. Thus,the correct combination is $(ii)$ and $(iv)$.

What is filled into the concrete tank of a biogas plant?
$(i)$ Nutrients
$(ii)$ Cow dung
$(iii)$ Methanogens
$(iv)$ Organic waste

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What is filled into the concrete tank of a biogas plant?$(i)$ Nutrients$(ii)$ Cow dung$(iii)$ Methanogens$(iv)$ Organic waste