Identify the odd one out.

Which of the following statements are associated with silage?
$(i)$ Prepared with the help of $Propionibacterium$ $sharmanii$.
$(ii)$ Used in the preparation of bread.
$(iii)$ It is a type of cattle feed.
$(iv)$ Used for the production of ethanol.
$(v)$ Produced by the fermentation of carbohydrates present in green plant tissues.

Which of the following is not used for the disinfection of drinking water?

Mark the mismatched pair:

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

Micro-organisms are used in: