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Assertion : Double circulation is incomp...

Assertion : Double circulation is incomplete in amphibians and reptiles
Reason : Unlike in birds and mammals, in amphibian and reptiles, the left atrium receives oxygenated blood and right atrium receives deoxygenated blood.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Double Circulation**: - Double circulation refers to the separation of oxygenated and deoxygenated blood in the circulatory system. In animals with complete double circulation (like birds and mammals), the blood flows through the heart twice: once for oxygenation in the lungs and once to deliver oxygen to the body. 2. **Circulatory System in Amphibians and Reptiles**: - Amphibians and reptiles typically have a three-chambered heart, consisting of two atria and one ventricle. This structure allows for some mixing of oxygenated and deoxygenated blood, leading to incomplete double circulation. 3. **Assertion Analysis**: - The assertion states that "Double circulation is incomplete in amphibians and reptiles." This is true because their heart structure does not completely separate the oxygenated and deoxygenated blood. 4. **Reason Analysis**: - The reason states that "Unlike in birds and mammals, in amphibians and reptiles, the left atrium receives oxygenated blood and the right atrium receives deoxygenated blood." This is also true. However, it does not fully explain why double circulation is incomplete. The mixing of blood occurs in the single ventricle, which is not mentioned in the reason. 5. **Conclusion**: - Both the assertion and reason are true, but the reason does not correctly explain the assertion. Therefore, the correct answer is that the assertion is true, the reason is true, but the reason is not the correct explanation of the assertion. ### Final Answer: - **Assertion**: True - **Reason**: True - **Explanation**: The assertion is correct, but the reason does not adequately explain the assertion.
### Step-by-Step Solution: 1. **Understanding Double Circulation**: - Double circulation refers to the separation of oxygenated and deoxygenated blood in the circulatory system. In animals with complete double circulation (like birds and mammals), the blood flows through the heart twice: once for oxygenation in the lungs and once to deliver oxygen to the body. 2. **Circulatory System in Amphibians and Reptiles**: - Amphibians and reptiles typically have a three-chambered heart, consisting of two atria and one ventricle. This structure allows for some mixing of oxygenated and deoxygenated blood, leading to incomplete double circulation. ...
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