Skip to content

Why do arteries have… (Class 10 Science SQP 2023-24, Q23b)

questionbuddy.in/q/cbse-10-science-2023-24-sqp-q23b-arteries-thick-elastic-walls-whereas

ScienceCBSE Class 10 · Sample paper, session 2023-24 · 2 marks · Very short answer

CBSE Class 10 Science sample paper 2023-24: question 23(b)

From the official CBSE sample question paper for 2023-24, section B, question 23(b), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q23(b) · 2 marks · Very short answerLife Processes

Why do arteries have thick and elastic walls whereas veins have valves?

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2023-24.

Hints

Open one hint at a time and try again before the next.

Hint 1

Compare the blood pressure in arteries and in veins.

Hint 2

What would happen to low-pressure blood in veins without valves?

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. Arteries carry blood away from the heart, and this blood is under high pressure. They need thick, elastic walls to withstand and adjust to this pressure.

    1 mark

  2. Veins carry blood at low pressure back to the heart. They have valves that stop the blood flowing backwards, so it moves in one direction only.

    1 mark

Answer: Arteries: thick elastic walls to bear high blood pressure; veins: valves to keep low-pressure blood flowing one way

Where the marks are

  • Arteries carry high-pressure blood from heart, hence thick elastic walls (1 mark)
  • Valves in veins ensure one-way flow and prevent backflow (1 mark)

Revise the chapter

  • Chapter: Life Processes (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Life Processes, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2023-24: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.