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14. 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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These can be arranged as Penicillin - Biogas- Curd- Citric acid.

Penicillin is an antibiotic which is used to cure many diseases like pneumonia. Thus it should be the most important.

Biogas serves as a source of clean fuel, so it is the second most important.

Curd comes next which is a nutritious milk product.

Citric acid is used in food processing industries. Thus, it is last in the list

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