In frog (Rana tigrina), which of the following correctly explains the mechanism of respiration during hibernation?
Respiration occurs mainly through lungs due to increased oxygen demand
Buccopharyngeal respiration increases while cutaneous respiration stops
Cutaneous respiration becomes the primary mode due to moist skin and reduced metabolic rate
Gills redevelop temporarily to facilitate aquatic respiration
During hibernation, frogs remain buried in mud under water or moist environments where oxygen availability is low and metabolic rate decreases significantly.
1. Frogs rely mainly on cutaneous respiration (through skin) during this period.
2. Their skin is thin, moist, and highly vascular, allowing efficient gas exchange.
3. Pulmonary (lung) respiration is minimal, as frogs are inactive.
4. Buccopharyngeal respiration is also reduced compared to active states.
5. Frogs do not redevelop gills in adulthood.
Hence, cutaneous respiration dominates during hibernation, making Option C correct.
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