Paper 1 · People, Development and Environment
Assertion (A): In a lake polluted with pesticides, the big fish will contain the maximum amounts of pesticides as a result of biomagnification. Reason (R): Biomagnification is the process in which a harmful chemical enters the food chain and gets concentrated at each level in the food chain. Choose the correct answer.
ABoth (A) and (R) are true and (R) is the correct explanation of (A) ✓ Correct
BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
C(A) is true, but (R) is false
D(A) is false, but (R) is true
Correct answer: (A) Both (A) and (R) are true and (R) is the correct explanation of (A) — Both (A) and (R) are true, and (R) correctly explains (A), so that is the answer.
Explanation
★Both (A) and (R) are true, and (R) correctly explains (A), so that is the answer.
★The assertion says the big fish hold the most pesticide through biomagnification.
★The reason explains that a chemical concentrates more at each higher food-chain level.
★The big fish, being at the top, therefore carry the highest concentration.
★So the reason explains why the big fish are the most contaminated.
★So both are true and (R) is the correct explanation of (A).
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