Question

Assertion (A): In amphibians and reptiles the blood circulation is described as incomplete double circulation.
Reason (R): They have a single ventricle in the heart, where oxygenated and deoxygenated blood are mixed and then circulated to the body parts as mixed blood.

• A. Both (A) and (R) are true, (R) is the correct explanation of (A)
• B. Both (A) and (R) are true, (R) is not the correct explanation of (A)
• C. (A) is true, but (R) is false
• D. (A) is false, but (R) is true

Hint:

Incomplete double circulation = single ventricle mixing in amphibians/reptiles.

Answer 1

The Correct Option is A

• Amphibians and reptiles have a double circulatory system, but incomplete because only one ventricle.
• Single ventricle allows mixing of oxygenated and deoxygenated blood.
• This mixing makes the circulation “incomplete double”.
• Hence correct answer: Both (A) and (R) are true, (R) is the correct explanation of (A).