Arrange the following in the decreasing order of importance for the welfare of human society. Give a reason for your answer.
Biogas, Citric acid, Penicillin and Curd.

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Solution

(i) Penicillin - It is used to obtain antibiotic which is used to cure many bacterial diseases.
(ii) Biogas - It is an ecofriendly source of energy particularly in rural areas.
(iii) Curd - It is easily digestible vitamin rich food.
(iv) Citric acid - It is used mainly as preservatives of many food items.

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Arrange the following in the decreasing order of importance for the welfare of human society. Give a reason for your answer. Biogas, Citric acid, Penicillin and Curd.

Arrange the following in the decreasing order of importance for the welfare of human society. Give a reason for your answer.
Biogas, Citric acid, Penicillin and Curd.