Question

Single circulation i.e. blood flows through the heart only once during one cycle of passage through the body, is exhibited by

Options

• Labeo, Chameleon, Salamander

• Hippocampus, Exocoetus, Anabas

• Hyla, Rana, Draco

• Whale, Dolphin, Turtle

Answer 1

Hippocampus, Exocoetus, Anabas

Explanation - 

In Option a) Chameleon is a reptile and Salamander is an amphibian which has 3 chambered hearts and shows partial double circulation. In Option c) all are Amphibians and they show partial double circulation. In option d) Whale is a mammal but turtle is a reptile hence option d) is wrong.