Question

Microbes are used in
(i) primary treatment of sewage
(ii) secondary treatment of sewage
(iii) production of biogas
(iv) production of bioactive molecules

• A. i, iii, iv
• B. i, ii, iii, iv
• C. ii, iii, iv
• D. iii, iv

Answer 1

The correct option is C ii, iii, iv

Several microbes are useful to human in diverse ways. Microbes are used:

• to produce household as well as industrial products
• in secondary treatment
• in production of biogas
• in production of bioactive molecules
• in production of bioferlizers and biocontrol agents.

But, microbes are not used in the primary treatment of sewage which basically involves removal of large particles through filtration and sedimentation.