Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ — decoded step-by-step.
Solve it the standard way once — then learn the shortcut.
Q · Environmental PollutionMedium · 45s
Which of these can cause biomagnification in food chains? 1. DDT 2. Mercury 3. Nitrogen oxides Select the correct answer:
TopicEnvironmental Pollution
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
DDT and mercury accumulate and magnify up the food chain; NOx does not biomagnify.
Final Answer: Option B — 1 and 2 only