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.

The order according to the importance will be
Penicillin - Biogas - Citric acid - Curd.

1.Penicillin. It is an antibiotic used to control number of bacterial diseases such as malaria , diphtheria, lung infection etc.

2. Biogas. It is an ecofriendly gas which is used as a fuel. The slurry produced by its production is used as a manure.

3. Citric acid. It is used as preservative in many food items.

4. Curd. It is a dairy product which is a rich source of vitamin B_^12.

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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.

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.