Question

Which of these are biodegradable pollutants?
(i) Pesticides
(ii) Mercuric salts
(iii) Sewage
(iv) Radioactive wastes

• A. (i) and (ii)
• B. (i) and (iii)
• C. (i), (iii) and (iv)
• D. (iii) only

Answer 1

The correct option is D (iii) only

The substances that can be broken down into simple substances in native are biodegradable substances. Sewage is one such type of biodegradable pollutants. Example: wool, agriculture residue,animal waste, plants etc. Non-biodegradable reactants are those which cannot be degraded or decomposed by any natural process. Example: pesticides, bags,glass objects, polythene, DDT rubber, paint.