Question

Match the column I with column II and mark the appropriate choice.

	Column I (Pollutants)		Column II (Source)
(a)	Toxic heavy metals	(i)	Domestic sewage
(b)	Microorganisms	(ii)	Industries and chemical factories
(c)	Organic wastes	(iii)	Chemical fertilizers
(d)	Plant nutrients	(iv)	Discharge from food processing factories

• A. (a) $\to$ (i), (b) $\to$ (iii), (c) $\to$ (ii), (d) $\to$ (iv)
• B. (a) $\to$ (iii), (b) $\to$ (iv), (c) $\to$ (i), (d) $\to$ (ii)
• C. (a) $\to$ (iv), (b) $\to$ (ii), (c) $\to$ (iii), (d) $\to$ (i)
• D. (a) $\to$ (ii), (b) $\to$ (i), (c) $\to$ (iv), (d) $\to$ (iii)

Answer 1

Answer: (D)

(a) $\to$ (ii), (b) $\to$ (i), (c) $\to$ (iv), (d) $\to$ (iii)

a) Toxic heavy metals are released from the industries and chemical factories lead to environmental pollution. $\Rightarrow \left(ii\right)$

b) Microorganisms play an important role in sewage treatment. $\Rightarrow \left(ii\right)$

c) Food processing waste is fresh organic material, is difficult to treat.$\Rightarrow \left(ii\right)$

d) Chemical fertilizers supply nutrients to plants. $\Rightarrow \left(iii\right)$

Hence, option D is correct.