Question

Assertion :The 4-chambered heart of birds is superior to the 4-chambered heart of crocodiles. Reason: Crocodilian heart retains both systemic arches that join, causing mixing of blood in the dorsal aorta while avian heart has lost left systemic arch.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

The four chambered heart of birds is not superior to the four chambered heart of crocodiles. Both have heart as a muscle that pumps blood. Crocodile's heart has two aortic arches helping it to breath under water, which makes it's heart more complex than bird's heart.

Crocodile has two aortic arches, the two aortic arches connect with each other with the help of foramen of penizza as soon as they leave the heart but merge completely in the lower parts of the body away from the heart.

So, the correct option is 'Both assertion and reason are incorrect'.