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NEET2026ZoologyBreathing and Exchange of GasesActual

Sponges exchange O₂ with CO₂ by __________.

Options

  1. Agills
  2. Bsimple diffusion over their entire body surfaces
  3. Cmoist cuticle
  4. Dtracheal tubes

Correct answer

B. simple diffusion over their entire body surfaces

Step-by-step solution

Sponges, coelenterates, and flatworms exchange O₂ with CO₂ by simple diffusion over their entire body surfaces. Gills are used by most aquatic arthropods and molluscs. Earthworms use their moist cuticle for gas exchange. Insects have a network of tubes called tracheal tubes to transport atmospheric air within the body. Answer: simple diffusion over their entire body surfaces

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