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In water, frogs respire using.
In water: SKIN only (cutaneous)! On land: Skin, Buccal cavity, and Lungs (pulmonary)!
Frogs exhibit three distinct modes of respiration depending on their environmental state: 1. Cutaneous Respiration: Gas exchange across the thin, moist, highly vascularized skin. This is the SOLE mode of respiration when the frog is submerged in water, as well as during winter sleep (hibernation) and summer sleep (aestivation). 2. Buccopharyngeal Respiration: Occurs on land when the mouth remains closed while the buccal floor moves up and down. 3. Pulmonary Respiration: Occurs on land using a pair of sac-like lungs.
1. Buccal cavity: Used only on land; cannot draw dissolved oxygen underwater. 2. Lungs: Frogs cannot breathe water into their lungs; lungs function exclusively in atmospheric air. 3. Trachea: Frogs lack a true trachea (they have a laryngotracheal chamber leading directly to lungs).
In water, frogs respire using skin.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Exact match with NCERT Frog morphology: Cutaneous respiration via skin is the exclusive aquatic respiratory mechanism.
Incorrect. Buccal respiration occurs only on land in atmospheric air.
Incorrect. Lungs are used for pulmonary respiration on land, never underwater.
Incorrect. Frogs do not possess a trachea (tracheae are insect respiratory organs).
On land, frogs use Skin + Buccal Cavity + Lungs. In water, frogs use ONLY their skin (Cutaneous respiration).
"In water, dissolved oxygen is exchanged across the moist skin by simple diffusion."
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