Q18
1 markMCQSection A

Assertion (A): In the human heart ventricles have thicker muscular walls than atria.

Reason (R): Ventricles have to pump the blood into various organs.

Life Processes
Transportation in Human Beings

Options

(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.
Official Answer

Option A is correct. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

ventriclesthicker muscular wallspump bloodvarious organs

Marking Scheme

  • 11 Mark for selecting the correct option (A).

Hint

Consider where the ventricles pump blood compared to the atria, and why they would need stronger muscular walls to generate higher pressure.

Quick Oral Answer

Ventricles have thicker walls because they pump blood to various organs of the body under high pressure, whereas atria only pump blood to the ventricles.

Analysis & Explanation

Ventricles have to pump blood into various organs of the body (such as the lungs and systemic organs) which requires high pressure. To withstand this high pressure and pump blood efficiently over longer distances, they have thicker muscular walls compared to the atria, which only need to pump blood into the ventricles. Therefore, both the assertion and reason are correct, and the reason explains the assertion.

Common Mistakes

  1. 1Thinking that atria have thicker walls because they receive blood first.
  2. 2Believing the reason is false because they think ventricles only pump to the lungs.

Interesting Facts

The left ventricle has walls that are about three times thicker than the right ventricle because it must generate enough pressure to pump blood throughout the entire body.

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Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2024?

This question carries 1 mark in the CBSE Class 10 Science 2024 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Life Processes" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Transportation in Human Beings" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2024 paper?

This is a MCQ question from Section A in the CBSE Class 10 Science 2024 paper.