Paper 1 · People, Development and Environment
UGC NET June 2024 Re-Exam (21.08.2024) Shift-I
Dissolved Oxygen (DO), a water quality parameter, is essential in which of the following water bodies/sources? Choose the most appropriate answer from the options given below.
- 1. River water
- 2. Lake water
- 3. Underground water
- 4. Pond water
A1, 2 and 4 only ✓ Correct
B3 and 4 only
C2, 3 and 4 only
D1, 3 and 4 only
Correct answer: (A) 1, 2 and 4 only — Dissolved oxygen is essential in river, lake and pond water, so the answer is 1, 2 and 4.
Explanation
★Dissolved oxygen is essential in river, lake and pond water, so the answer is 1, 2 and 4.
★Dissolved oxygen matters for surface waters that support aquatic life.
★River water carries aquatic organisms that depend on dissolved oxygen.
★Lake water and pond water are surface bodies where dissolved oxygen sustains life.
★So statements 1, 2 and 4 are the relevant water bodies.
★Underground water is not an open surface habitat in this sense, so statement 3 is excluded.
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