Q.

Incomplete double blood circulation occurs in which of the following?

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a

Labeo and Salamandra

b

Rana and Hemidactylus

c

Pavo and Canis

d

Pristis and Clarias

answer is B.

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Detailed Solution

Incomplete double circulation occurs in amphibians (e.g., Rana and Salamandra) and reptiles (e.g., Hemidactylus). 

Single circulation occurs in fishes (Pristis, Labeo and Clarias). 

Complete double circulation occurs in birds (e.g., Pavo) and mammals (e.g., Canis).

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