Class 11 · Body Fluids and Circulation

Heart Evolution in Vertebrates — NEET Biology

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📖 NCERT Source

Describe the evolutionary change in the pattern of heart among the vertebrates.

NCERT Biology · Class 11 · Chapter 15 · Paragraph 54
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QuestionPractice Question

Assertion (A): Fishes have a different pattern of blood circulation compared to mammals. Reason (R): Fishes have double circulation while mammals have single circulation.

📖 Solution & NCERT Explanation
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Correct answer: C If assertion is true but reason is false.

NCERT confirms different circulation patterns exist (Assertion true). However, NCERT states fishes have “single circulation” where “blood passes through heart once per complete circuit” while mammals have double circulation. Reason reverses this, making it false.

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What does NCERT say about Describe evolutionary change pattern?
Describe the evolutionary change in the pattern of heart among the vertebrates.
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Which chapter is this from?
Body Fluids and Circulation, Class 11 NCERT Biology.

Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.

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