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What is the primary role of bacteria in water with organic matter?

Options

  1. AThey increase the oxygen concentration in water.
  2. BThey consume dissolved oxygen in water.
  3. CThey convert organic matter into oxygen.
  4. DThey have no impact on water quality.

Correct answer

B. They consume dissolved oxygen in water.

Step-by-step solution

Bacteria in water decompose organic matter and, in the process, consume the dissolved oxygen in the water, which can lead to a reduction in oxygen levels, affecting aquatic life.

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