Select the correct statement from th following.A. Activated sludge in settlement tanks of sewage treatment plant is a rich source of aerobic bacteriaB. Biogas is produced by the activity of aerobic bacteria on naimal waste (dung)C. Methanobacterium is an aerobic bacterium found in rumen of cattleD. Biogas, commonly called gobar gas, is pure methane.

Select the correct statement from th following.A. Activated sludge in

1.	Select the correct statement from th following.A. Activated sludge in settlement tanks of sewage treatment plant is a rich source of aerobic bacteriaB. Biogas is produced by the activity of aerobic bacteria on naimal waste (dung)C. Methanobacterium is an aerobic bacterium found in rumen of cattleD. Biogas, commonly called gobar gas, is pure methane.
Answer» Correct Answer - A ` ` Biogas is produced by the activity of anaerobic bacteria on animal waste (dung). `` Methanobacterium is an anaerobic bacterium found in rumen of cattle. `*` Biogas, commonly called gobar gas, is mainly methane (about 70%).

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Arrange the following in the decreasing order (most important first) of their importance, for the welfare of human society. Give reasons for your answer. Biogas, Citric acid, Penicillin and Curd
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