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State the main function of… (Class 10 Science 2025, Q23)

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ScienceCBSE Class 10 · Board exam 2025, set 31/3/1 · 2 marks · Very short answer

CBSE Class 10 Science 2025: question 23

Set in the CBSE Class 10 board exam of 2025, paper 31/3/1, section B, question 23, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q23 · 2 marks · Very short answerLife Processes

State the main function of veins in human circulatory system. Why do they not need thick walls?

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/3/1.

Hints

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

Hint 1

Veins carry blood in which direction relative to the heart?

Hint 2

Compare the pressure of blood in veins with that in arteries.

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. Veins collect deoxygenated blood from the different organs of the body and carry it back to the heart.

    1 mark

  2. Blood in veins flows under low pressure, so thick elastic walls are not needed; valves keep the blood flowing in one direction.

    1 mark

Answer: Veins return deoxygenated blood from organs to the heart; their walls are thin because blood in them is at low pressure.

Where the marks are

  • Function: carry deoxygenated blood from organs back to the heart (1 mark)
  • Reason: blood flows under low pressure in veins (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 paper2025 board paper, set 31/3/1: 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.