Q1. [1] § 5.4 TRANSPORTATION
Assertion (A) : In the human heart ventricles have thicker muscular walls than atria.
Reason (R) : Ventricles have to pump the blood into various organs.
- A Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
- B Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
- C Assertion (A) is true, but Reason (R) is false.
- D Assertion (A) is false, but Reason (R) is true.
Previously asked in CBSE board exam
2024 31/4/1 Q18
Generated by claude-sonnet-4-6 · 2026-06-11 09:51 · grounding rag
Model Answer
Option A — Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
Explanation
The textbook directly states: "Since ventricles have to pump blood into various organs, they have thicker muscular walls than the atria do." This confirms both the assertion and the reason, and the reason directly explains why ventricles have thicker walls. So option A is correct.
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