Q.Four chambered heart is present in
a. Lizard
b. Snake
c. Scorpion
d. Crocodile

Step 1. Most reptiles have a three-chambered heart, which allows some mixing of oxygenated and deoxygenated blood.

Step 2. The chapter specifically notes that crocodiles are the exception among reptiles, possessing a fully four-chambered heart, similar in chamber count to birds and mammals, though the pulmonary circuits still differ physiologically. …

Recall the chapter's specific exception (crocodiles) to the general th …

• Overlooking that crocodiles are a stated exception to the 'reptiles have a three-chambered heart' rule. …