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Solution


Q.

Which one of the following animals has two separate circulatory pathways             [2015]
1 Whale    
2 Shark  
3 Frog    
4 Lizard  

Ans.

(1)

Whale is a mammal and in mammals, two separate circulatory pathways are found — systemic circulation and pulmonary circulation. Oxygenated and deoxygenated bloods received by the left and right atria respectively pass on to the left and right ventricles. Thus, oxygenated and deoxygenated bloods are not mixed. This is referred to as double circulation.