Which one among the following animals can perform respiration either through gills or through lungs ?
Fish
Frog
Snake
Cow
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This question was previously asked in
UPSC CISF-AC-EXE – 2021
Amphibians, like frogs, typically undergo metamorphosis. Their larval stage (tadpole) is usually aquatic and respires through gills. The adult stage is often terrestrial or semi-aquatic and respires primarily through lungs and also through their moist skin. Fish respire only through gills. Snakes (reptiles) and Cows (mammals) respire only through lungs.
Respiration is the process of gas exchange (oxygen intake and carbon dioxide release). Different animals have evolved various respiratory organs depending on their environment. Gills are specialized structures for extracting oxygen from water, while lungs are adapted for gas exchange in air. Amphibians exhibit a dual mode of respiration, reflecting their transition from aquatic to terrestrial life.