Question:
Sponges and Coelenterates respire through-------------------.
Sponges and Coelenterates respire through-------------------.
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Simple animals with thin body walls exchange gases by diffusion through the cell membrane.
Updated On: Nov 12, 2026
- Book gills
- Plasma membrane
- Book lungs
- Cloaca
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Sponges and coelenterates have no respiratory organs, and their body wall is only a few cell layers thick.
Step 2: Gas exchange
Each cell is close to the surrounding water, so oxygen enters and carbon dioxide leaves by simple diffusion through the plasma membrane over the body surface.
Step 3: Why the other options fail
Book gills belong to king crab, book lungs to scorpions and spiders, and cloacal respiration to certain turtles and sea cucumbers.
Final Answer:
Sponges and coelenterates respire through the plasma membrane. \[ \boxed{\text{(B) }\text{Plasma membrane}} \]
Sponges and coelenterates have no respiratory organs, and their body wall is only a few cell layers thick.
Step 2: Gas exchange
Each cell is close to the surrounding water, so oxygen enters and carbon dioxide leaves by simple diffusion through the plasma membrane over the body surface.
Step 3: Why the other options fail
Book gills belong to king crab, book lungs to scorpions and spiders, and cloacal respiration to certain turtles and sea cucumbers.
Final Answer:
Sponges and coelenterates respire through the plasma membrane. \[ \boxed{\text{(B) }\text{Plasma membrane}} \]
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