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, Pencillin and Curd.

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Solution

Biogas is a mixture of methane (CH₄), carbon dioxide (CO₂), hydrogen (H₂) and hydrogen sulphide (H₂S) with methane as a major component (65%). Methanogens produce biogas by anaerobic fermentation of biomass in presence of water which in turn serve as an eco-friendly and economic source of energy. Penicillin is antibiotic used in different bacterial infections. The curd is a fermented dairy product used by a human as a nutrient source. Citric acid is used as food preservatives.

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