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What happens to dissolved oxygen in water during the night?

Options

  1. AIt increases due to bacterial respiration.
  2. BIt remains constant.
  3. CIt decreases due to bacterial respiration.
  4. DIt increases due to photosynthesis.

Correct answer

C. It decreases due to bacterial respiration.

Step-by-step solution

During the night, photosynthesis stops, but aquatic plants and microorganisms continue to respire, leading to a reduction in dissolved oxygen in the water.

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