Paper 1 · People, Development and Environment
Assertion (A): As a result of biomagnification, the secondary consumers will be the most toxic. Reason (R): The contaminants in biomagnification may be heavy metals such as mercury and arsenic, and pesticides such as polychlorinated biphenyls and DDT. 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.
★In biomagnification, toxins build up more at each higher level of the food chain.
★So the secondary consumers, being higher up, become the most toxic.
★The reason names the very contaminants, heavy metals and persistent pesticides, that build up this way.
★So the reason explains why the higher consumers grow most toxic.
★So both are true and (R) is the correct explanation of (A).
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