Paper 1 · People, Development and Environment
UGC NET December 2022 (02.03.2023) Shift-II
What is the correct sequence of biomagnification due to a contaminated water body?
- Humans
- Zooplanktons
- Bacteria
- Fish
A1, 3, 4, 2
B3, 2, 4, 1 ✓ Correct
C1, 4, 2, 3
D2, 3, 4, 1
Correct answer: (B) 3, 2, 4, 1 — The correct sequence is bacteria, zooplanktons, fish, humans, so the answer is 3, 2, 4, 1.
Explanation
★The correct sequence is bacteria, zooplanktons, fish, humans, so the answer is 3, 2, 4, 1.
★Biomagnification passes contaminants up the food chain.
★The contaminant first enters the smallest organisms, the bacteria, which is item 3.
★The zooplanktons eat the bacteria, which is item 2.
★The fish eat the zooplanktons, which is item 4.
★Finally humans eat the fish, which is item 1.
★So the sequence is 3, 2, 4, 1.
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