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Biology Question 103 – NEET-UG 2026

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In water, frogs respire using ________.

Frogs, being amphibians, have adapted to respire in both aquatic and terrestrial environments, utilizing different organs for gas exchange.

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Ninja Strategy•Physiological Adaptation Recall

Recall the specific respiratory adaptations of amphibians for aquatic environments, focusing on the most efficient organ for dissolved oxygen uptake.

Step 1: Identify Frog's Respiratory Adaptations✦ Active

Frogs are amphibians, meaning they can live both on land and in water. They possess multiple respiratory organs to adapt to these different environments.

Step 2: Analyze Respiration in Water○ Expand

When a frog is submerged in water, its primary mode of respiration is through its skin. The skin is thin, moist, and richly supplied with blood vessels, allowing for the efficient diffusion of dissolved oxygen from the water into the blood and carbon dioxide out of the blood. This process is known as cutaneous respiration.

💡 Teacher's Secret Hint

Cutaneous respiration is highly efficient in water due to the large surface area and moist nature of the skin.

Step 3: Evaluate Options○ Expand

Option (1) skin: Correct, as cutaneous respiration is the primary method for gas exchange in water. Option (2) buccal cavity: Buccal respiration occurs, but it is a supplementary mode and less efficient than skin respiration in water. Option (3) lungs: Lungs are primarily used for pulmonary respiration when the frog is on land. Option (4) trachea: Trachea is a respiratory structure found in insects or mammals, not typically in frogs for aquatic respiration.

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