HARD
12th Andhra Pradesh Board
IMPORTANT
Earn 100

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, penicillin, Citric acid and curd.

Important Questions on Microbes in Human Welfare

MEDIUM
12th Andhra Pradesh Board
IMPORTANT
 What is sewage? 
HARD
12th Andhra Pradesh Board
IMPORTANT
 In which way can sewage be harmful to us?
HARD
12th Andhra Pradesh Board
IMPORTANT
 What is the key difference between primary and secondary sewage treatment?