Dissolved Oxygen in Water
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Questions and Answers

What is the primary importance of dissolved oxygen (DO) mentioned in the text?

  • It is a measure of the amount of oxygen dissolved in water.
  • It is essential for plant growth in water bodies.
  • It indicates the purity of water.
  • It determines the quality of water for aquatic life. (correct)
  • What happens when more oxygen is consumed than produced in a water body?

  • DO levels decline, and sensitive animals may move away, weaken, or die. (correct)
  • DO levels remain constant, and aquatic life is unaffected.
  • DO levels increase, and sensitive animals thrive.
  • DO levels fluctuate, and aquatic life adapts to the changes.
  • Which factor does NOT affect the DO levels in water?

  • Salinity (correct)
  • Water temperature
  • Altitude
  • Seasonal changes
  • Which statement is true about the relationship between water temperature and DO levels?

    <p>Colder water holds more oxygen than warmer water.</p> Signup and view all the answers

    How do DO levels vary with altitude?

    <p>DO levels decrease with higher altitudes.</p> Signup and view all the answers

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