JEE Main levelSingle correct optionDifficulty 2 of 3ev139
Match the source of pollution (Column I) with its characteristic effect (Column II).
Column I: P = phosphate in run-off, Q = oil spill, R = hot effluent from a plant, S = DDT in a food chain.
Column II: 1 = eutrophication, 2 = film that limits oxygen exchange, 3 = lower solubility of oxygen, 4 = biomagnification.
AP-1, Q-3, R-2, S-4
BP-2, Q-1, R-4, S-3
CP-4, Q-2, R-3, S-1
DP-1, Q-2, R-3, S-4
Answer: D
Phosphates cause eutrophication, an oil film limits oxygen exchange with air, warm water dissolves less oxygen, and DDT undergoes biomagnification.