Question

Assertion: Crocodiles have a four chambered heart.
Reason: Most reptiles have a three chambered heart.

Choose the correct answer.

• A. Both assertion and reason are true and reason is the correct explanation for the assertion
• B. Both assertion and reason are true but reason is not the correct explanation for the assertion
• C. Assertion is true but reason is false
• D. Both assertion and reason are false

Answer 1

The correct option is B Both assertion and reason are true but reason is not the correct explanation for the assertion

All reptiles have a three-chambered heart, except the crocodile, alligators which has a four-chambered heart. All other members of Reptilia have three chambered hearts with an incomplete septum in the ventricle. Crocodiles have a four-chambered heart because the septum is complete resulting in the formation of a four-chambered heart. Hence, it is an exception in reptiles with a four-chambered heart. So, both assertion and reason are true but the reason is not the correct explanation for the assertion.