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

Which of the following statements is incorrect?

Which of the following is essential to avoid environmental pollution?

Read the following four statements $(A-D)$.
$(A)$ Colostrum is recommended for the new born because it is rich in antibodies.
$(B)$ Chikungunya is caused by a Gram-negative bacterium.
$(C)$ Tissue culture has proved useful in obtaining virus-free plants.
$(D)$ Beer is manufactured by distillation of fermented grape juice.
How many of the above statements are wrong?

Correctly match column $I$ with column $II$:

Column $I$	Column $II$
$(A)$ Trichoderma species	$(i)$ Biofertilisers
$(B)$ Rhizobium	$(ii)$ Clot buster
$(C)$ Cyclosporin $A$	$(iii)$ Biocontrol agents
$(D)$ Streptokinase	$(iv)$ Trichoderma polysporum

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