Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by________________?
Correct answer: C. Both A. & B.
- A. Natural aeration of water stream
- B. Photosynthetic action of algae
- C. Both A. & B.
- D. Neither A. nor B.
Explanation
Dissolved oxygen is replenished naturally across the air-water interface and also produced by algae through photosynthesis when light is available. Thus both natural aeration and algal activity contribute.
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