Question

Heart of a crocodile is
A. Single chambered
B. Two chambered
C. Three chambered
D. Four chambered
E. Multi chambered

Answer 1

Hint: Crocodiles are great reptiles seen in tropical areas of Asia, Africa, Australia and America. They are parts of the order Crocodilia, which also holds gharials, caimans, and alligators.

Complete Answer:
Let us examine the given options to find the correct answer.

Option A: Heart with only one chamber does not exist, therefore, this option is incorrect.

Option B: The hearts of fishes are two-chambered, they have only one ventricle and one atrium. Therefore, this is an incorrect option.

Option C: Frogs has a three-chambered heart. It contains one ventricle and two atria. Therefore, this is an incorrect option.

Option D: The heart of a crocodile is different from other reptiles as it has four chambers just similar to animals and birds. Blood is carried to the lungs for gas transfer from the right and the left ventricle, it is pumped to the body. Thus, the two kinds of blood do not blend in the heart. However, blood is combined as soon as it transmits the heart via a valve located in between the left and right aorta. Therefore, this is the correct option.

Option E: Animals with more than one heart are known as multi-chambered hearts. This is not seen in crocodiles. Therefore, this is an incorrect answer.

Thus, option D is the correct answer.

Note: Crocodiles are reptiles despite the fact they have four chambered heart for the following reasons,
- They have dry scaly skin as seen in reptiles.
- They lay eggs as seen in reptiles.
- They are cold blooded animals just like reptiles.