Question

How many-chambered heart do the crocodiles have

• A. 3
• B. 4
• C. 2
• D. 1

Answer 1

The correct option is (A):

Explanation of the correct option:

1. ​Reptiles generally have a three-chambered heart, while crocodile is an exception with a four-chambered heart.
   
2. There are two atrium and two ventricles in the heart forming the four chambers.
   
3. But the septum between the ventricle is not completely developed till the atrioventricular septum, which shows the evolution from reptiles to birds and mammals.
   

Final Answer: The crocodile has a 4-chambered heart.