ReNEET 2026 · Biology · Q150Breathing and Exchange of GasesIn our bank: Strong match · 85%
Sponges exchange O₂ with CO₂ by __________.
- A.simple diffusion over their entire body surfaces✓
- B.moist cuticle
- C.tracheal tubes
- D.gills
Correct Answer
(A) simple diffusion over their entire body surfaces
Solution & Explanation
Lower invertebrates such as sponges, coelenterates and flatworms exchange gases by simple diffusion over their entire body surface. (Earthworms use moist cuticle, insects use tracheal tubes, and aquatic arthropods/molluscs use gills.)
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