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प्रश्न
n the following groups of materials, which group/groups contain only non-biodegradable materials?
(i) wood, paper, leather
(ii) polythene, detergent, PVC
(iii) plastic, detergent, grass
(iv) plastic, bakelite, DDT
(a) (iii)
(b) (iv)
(c) (i) and (iii)
(d) (ii) and (iv)
उत्तर
(ii) and (iv)
These materials cannot be degraded by micro-organisms and hence are non-biodegradable.
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