Question

The most highly advanced character in crocodiles among Reptilia is the

• A. Presence of four chambered heart
• B. Capacity to come on the land
• C. Capacity to lay hard-shelled eggs
• D. Presence of powerful jaw muscles

Answer 1

The correct option is A Presence of four chambered heart

Reptilia is one of the major class of tetrapoda which shows crawling mode of locomotion and their body is covered by dry and cornified skin. The heart is mostly three chambered but the crocodiles have four chambered heart which is highly advanced character as four chambered heart are exhibited by birds and mammals. It is because they spend a lot of their time in water therefore they have adapted as when the crocodile is underwater it’s heart rate can slow right down to one or two beats per minute which helps reduce blood flow and save oxygen.

So, the correct answer is option A.