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  • Single circulation i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by (a) Labeo, Chameleon, Salamander (b) Hippocampus, Exocoetus, Anabas (c) Hyla, Rana, Draco (d) Whale, Dolphin, Turtle

Single circulation i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by
(a) Labeo, Chameleon, Salamander
(b) Hippocampus, Exocoetus, Anabas
(c) Hyla, Rana, Draco
(d) Whale, Dolphin, Turtle

Answers (1)

Ans: (b) Hippocampus, Exocoetus, Anabas.

Explanation: Blood passes through the heart only once in a complete cycle through the body, this is known as single circulation. This type of circulation is observed in species such as Hippocampus, Exocoetus, and Anabas, primarily in fish. Single circulation is less efficient because the gill capillaries slow down blood flow. As a result, the body receives blood at a lower pressure, which reduces the rate of oxygen supply to the cells. Hence option (b) is correct.

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