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)

Animal group                                      Heart                                       Examples

Amphibians and Reptiles                  3-chambered heart                  Salamander, Hyla,

                                                          (two atria and one ventricle)    Rana (Amphibians)
                                                                                                           Chameleon,

                                                                                                           Draco, Turtle

Fishes                                                2-chambered heart                   Hippocampus,

                                                          (one atrium and                         Labeo, Anabas,

                                                          one ventricle)                            Exocoetus etc.

Birds and mammals                          4-chambered heart                    Pigeon, parrot,

                                                         (two atria and                             whale, dolphins,

                                                         two ventricle)                            humans

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