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Science (086) — AI-generated practice question

AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.

Q1. [1] medium exam-ready
Assertion (A): Arteries have thicker and more elastic walls compared to veins. Reason (R): Blood flows through arteries under much higher pressure than through veins. (A) Both A and R are true and R is the correct explanation of A. (B) Both A and R are true but R is not the correct explanation of A. (C) A is true but R is false. (D) A is false but R is true.
  1. A Both A and R are true and R is the correct explanation of A.
  2. B Both A and R are true but R is not the correct explanation of A.
  3. C A is true but R is false.
  4. D A is false but R is true.
Generated by claude-sonnet-4-6 · 2026-06-26 00:59 · grounding rag
Model Answer

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

Arteries carry blood away from the heart under high pressure, so they need thick, elastic walls to withstand it. Veins carry blood at low pressure and have thinner walls.

Explanation

The textbook directly states: "Since the blood emerges from the heart under high pressure, the arteries have thick, elastic walls" and "Veins… do not need thick walls because the blood is no longer under pressure." The Reason correctly and directly explains the Assertion, making option (A) the right choice.

Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.