Question:
Which special feature among the following is seen in frogs for gaseous exchange through the skin?
Which special feature among the following is seen in frogs for gaseous exchange through the skin?
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Gases must dissolve in moisture and diffuse across a thin, richly supplied skin.
Updated On: Nov 12, 2026
- Skin is thick and dry.
- Skin is thin and moist.
- Skin is non-vascular
- Exoskeleton in the form of scales.
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
In cutaneous respiration, gases dissolve in a film of moisture and diffuse across the skin.
Step 2: Features of frog skin
Frog skin is thin, has no scales and is kept moist by mucous glands.
A dense network of capillaries lies just below it.
Step 3: Gas movement
Oxygen dissolves in the surface moisture and enters the blood. Carbon dioxide diffuses out.
Step 4: Why the other options fail
Thick dry skin, non-vascular skin or scales would block gas exchange.
Final Answer:
The frog's skin is thin and moist. \[ \boxed{\text{(B) }\text{Skin is thin and moist.}} \]
In cutaneous respiration, gases dissolve in a film of moisture and diffuse across the skin.
Step 2: Features of frog skin
Frog skin is thin, has no scales and is kept moist by mucous glands.
A dense network of capillaries lies just below it.
Step 3: Gas movement
Oxygen dissolves in the surface moisture and enters the blood. Carbon dioxide diffuses out.
Step 4: Why the other options fail
Thick dry skin, non-vascular skin or scales would block gas exchange.
Final Answer:
The frog's skin is thin and moist. \[ \boxed{\text{(B) }\text{Skin is thin and moist.}} \]
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