Respiratory Adaptations: Altitude and Diving · NCERT Biology

Why is oxygen extraction more difficult underwater than in air?

  1. Oxygen diffuses faster in water than in air
  2. Water contains less dissolved oxygen
  3. Water temperatures are consistently warmer than air
  4. Oxygen is chemically bonded within water molecules
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Correct answer: Water contains less dissolved oxygen

Water contains much less dissolved oxygen compared to air. This makes oxygen extraction more challenging for aquatic organisms.

Difficulty: Medium Question 9 of 20

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