Paper 1 · People, Development and Environment
UGC NET December 2022 (01.03.2023) Shift-I
Oxygen-demanding wastes
ADecrease the oxygen level in water ✓ Correct
BIncrease the oxygen level in water
CDo not change the oxygen level in water
DIncrease the temperature
Correct answer: (A) Decrease the oxygen level in water — Oxygen-demanding wastes decrease the oxygen level in water, so that is the answer.
Explanation
★Oxygen-demanding wastes decrease the oxygen level in water, so that is the answer.
★These wastes are substances that get oxidised in the water body.
★This oxidation uses up the dissolved oxygen in the water.
★So as the wastes break down, the oxygen level falls.
★This can harm fish and other aquatic life.
★So oxygen-demanding wastes decrease the oxygen level in water.
★So the answer is that they decrease the oxygen level in water.
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