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Which of the following respires by gills?
A. Prawn
B. Frog
C. Crocodile
D. Whale

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Last updated date: 16th Jun 2024
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Answer
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Hint:-Gills are the respiratory organs that support many aquatic animals to breathe in dissolved oxygen and exchange carbon dioxide underwater. The scientific name of the gill is branchia. The large surface area of the gill enables them to intake the maximum amount of oxygen and circulate them through the blood to tissues.

Complete Answer:-Aquatic animals such as molluscs, crustaceans, insects, fish, and amphibians are known to possess ‘Gil’ or gill-like organs for respiration. All aquatic animals do not respire through gills. There are aquatic animals who have lungs as their respiratory organ. The respiratory organs of the above-mentioned animals are described below.

Prawn, like all big water crustaceans, respire through gills. Premature prawns breathe through the whole body. Frogs are amphibians that are, they can survive both in the land as well as in water. In water, their respiration takes place via skin surfaces all over the body. In land, their respiration is accomplished via lungs as in humans. Crocodiles are reptiles and they breathe through lungs as they can survive both in air and water. Unlike other aquatic animals, Whales are aquatic mammals. Hence, instead of gills, they use lungs for respiration.

So the correct answer, from the above options, is option “A”, Prawn.

Note:- Semi Terrestrial marine animals such as crabs and mudskippers store dissolved oxygen from underwater in their gill chamber to use them when they come upon the land. Prawn is an aquatic insect. The more hierarchical rank possessed by an animal, the more organized, the organs become.