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Assertion: In amphibians and reptiles, double circulation is incomplete.
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.
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Assertion: In amphibians and reptiles, double circulation is incomplet...
Assertion and Reason Analysis:

Assertion:
Incomplete double circulation is present in amphibians and reptiles.

Reason:
In amphibians and reptiles, the left atrium receives oxygenated blood and the right atrium receives deoxygenated blood.

Explanation:
- Incomplete double circulation means that there is mixing of oxygenated and deoxygenated blood in the heart.
- In birds and mammals, complete double circulation occurs where oxygenated blood is separated from deoxygenated blood.
- In amphibians and reptiles, the blood flow is not completely separated into systemic and pulmonary circuits.
- The mixing of oxygenated and deoxygenated blood occurs in the heart chambers due to structural differences in the heart.
- In these species, the left atrium receives oxygenated blood from the lungs and skin, while the right atrium receives partially oxygenated or deoxygenated blood from the body.
- This mixing of blood in the heart chambers results in incomplete separation of oxygenated and deoxygenated blood, leading to incomplete double circulation.
Therefore, the Assertion is true as incomplete double circulation is present in amphibians and reptiles, but the Reason is false because the explanation provided does not correctly justify the Assertion.
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Community Answer
Assertion: In amphibians and reptiles, double circulation is incomplet...
Amphibians and the reptiles (except crocodiles) consists a 3-chambered heart with two atria and a single ventricle, whereas crocodiles, birds and mammals possess a 4-chambered heart with two atria and two ventricles. In amphibians and reptiles, the left atrium receives oxygenated blood from the gills/lungs/skin and the right atrium gets the deoxygenated blood from other body parts. However, they get mixed up in the single ventricle that pumps out mixed blood (incomplete double circulation). In birds and mammals, oxygenated and deoxygenated blood received by the left and right atria respectively passes on the ventricles of the same sides. The ventricles pump it out without any mixing up, i.e., two separate circulatory pathways are present in these organisms, hence, these animals have double circulation.
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Assertion: In amphibians and reptiles, double circulation is incomplete.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 Assertionc)If Assertion is true but Reason is false.d)If both Assertion and Reason are false.Correct answer is option 'C'. Can you explain this answer?
Question Description
Assertion: In amphibians and reptiles, double circulation is incomplete.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 Assertionc)If Assertion is true but Reason is false.d)If both Assertion and Reason are false.Correct answer is option 'C'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Assertion: In amphibians and reptiles, double circulation is incomplete.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 Assertionc)If Assertion is true but Reason is false.d)If both Assertion and Reason are false.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Assertion: In amphibians and reptiles, double circulation is incomplete.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 Assertionc)If Assertion is true but Reason is false.d)If both Assertion and Reason are false.Correct answer is option 'C'. Can you explain this answer?.
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