Arrangethe following in the decreasing order (most important first) of their importance, for the welfare of human society. Give reasons foryour answer.

Biogas,Citric acid, Penicillin and Curd

The orderof arrangement of products according to their decreasing importanceis:

Penicillin-Biogas − Citric acid − Curd

Penicillin is the mostimportant product for the welfare of human society. It is anantibiotic, which is used for controlling various bacterial diseases.The second most important product is biogas. It is an eco-friendlysource of energy. The next important product is citric acid, which isused as a food preservative. The least important product is curd, afood item obtained by the action of lactobacillus bacteria onmilk

Hence, the products inthe decreasing order of their importance are as follows:

Penicillin- Biogas −Citric acid − Curd

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