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Question
The site of external respiration in fishes is
The site of external respiration in fishes is
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Solution
The correct option is B Gills
External respiration commonly known as breathing, is the exchange of oxygen and carbon dioxide between an animal and its environment. Different animals use specialised organs or organ systems, such as lungs, trachea, or gills, for external respiration. In most of the fishes, the main organ for external respiration are gills. These are the paired respiratory organs of fish and some amphibians, by which oxygen is extracted from the water flowing over the surfaces within or attached to the walls of the pharynx. So the correct answer for the question is option B.
External respiration commonly known as breathing, is the exchange of oxygen and carbon dioxide between an animal and its environment. Different animals use specialised organs or organ systems, such as lungs, trachea, or gills, for external respiration. In most of the fishes, the main organ for external respiration are gills. These are the paired respiratory organs of fish and some amphibians, by which oxygen is extracted from the water flowing over the surfaces within or attached to the walls of the pharynx. So the correct answer for the question is option B.
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