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(A) $1$. In a sewage treatment plant,the sediment of the settling tank is called activated sludge,which serves as an inoculum for the aeration tank an

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In a sewage treatment plant,the activated sludge in the settling tank is the main source of aerobic bacteria.

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(A) $1$. In a sewage treatment plant,the sediment of the settling tank is called activated sludge,which serves as an inoculum for the aeration tank and is a rich source of aerobic bacteria. Thus,option $A$ is correct.$2$. Biogas is produced by the action of anaerobic bacteria (not aerobic) on cellulosic material present in animal waste (dung). Thus,option $B$ is incorrect.$3$. $Methanobacterium$ is an anaerobic bacterium,not an aerobic one. It is found in the rumen of cattle. Thus,option $C$ is incorrect.$4$. Biogas is a mixture of gases (primarily methane,$CO_2$,and $H_2S$),not pure methane. Thus,option $D$ is incorrect.

Select the correct statement from the following.

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