Paper 1 · People, Development and Environment
UGC NET December 2023 (08.12.2023) Shift-I
Arrange the following in increasing order of DDT concentration among them as a result of bioaccumulation. Choose the correct answer from the options given below.
- 1. Fish
- 2. Water body
- 3. Fish-eating birds
- 4. Zooplankton
A1, 2, 3, 4
B2, 4, 1, 3 ✓ Correct
C3, 4, 1, 2
D2, 1, 3, 4
Correct answer: (B) 2, 4, 1, 3 — The increasing order of DDT concentration is water body, zooplankton, fish, then fish-eating birds, so the answer is 2, 4, 1, 3.
Explanation
★The increasing order of DDT concentration is water body, zooplankton, fish, then fish-eating birds, so the answer is 2, 4, 1, 3.
★DDT concentration rises up the food chain through biomagnification.
★The water body holds the lowest, most diluted concentration of DDT.
★Zooplankton absorb DDT from the water, raising the level.
★Fish eat the zooplankton and accumulate more DDT.
★Fish-eating birds are at the top and hold the highest concentration, giving 2, 4, 1, 3.
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