question_answer 28)

  In the following groups of materials, which group(s) contains only non-biodegradable items? (i) Wood, paper, leather                                               (ii) Polythene, detergent, PVC (iii) Plastic, detergent, grass                                                        (iv) Plastic, Bakelite, DOT (a) (iii)                                   (b) (iv)                                  (c) (i) and (iii)                     (d) (ii) and (iv)

Answer:

                  (d) Substances that cannot be broken down by biological processes in nature are non-biodegradable, e.g., polythene, detergent, PVC, plastics, Bakelite, DDT etc. On the other hand, substances that are broken down by biological processes are said to be biodegradable, e.g., wood, paper, leather, grass, animal bones etc.