Match List I (Toxic substance) with List II (Source) and choose the correct answer from the options given below.

List I

i.Chloroform

ii.DDT

iii.Aroclor

iv.Chromium

List II

a.Pesticide

b.Paints

c.Water purification

d.Plastics

Ai-b, ii-c, iii-d, iv-a

Bi-a, ii-c, iii-b, iv-d

Ci-c, ii-a, iii-d, iv-b ✓ Correct

Di-c, ii-a, iii-b, iv-d

Correct answer: (C) i-c, ii-a, iii-d, iv-b

Explanation

Chloroform pairs with water purification, where it forms as a chlorination by product.

DDT pairs with pesticide, being a well known insecticide.

Aroclor pairs with plastics, as it is a polychlorinated biphenyl used in such products.

Chromium pairs with paints, where its compounds serve as pigments.

Each toxic substance is linked to the industrial or treatment activity that releases it.

Many of these, like DDT and polychlorinated biphenyls, persist and accumulate in food chains.

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