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One-cell thick blood vessels… (Class 10 Science 2025, Q7)

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ScienceCBSE Class 10 · Board exam 2025, set 31/2/1 · 1 mark · MCQ

CBSE Class 10 Science 2025: question 7

Set in the CBSE Class 10 board exam of 2025, paper 31/2/1, section A, question 7, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q7 · 1 mark · MCQLife Processes

One-cell thick blood vessels are known as :

  1. (A)Alveoli
  2. (B)Capillaries
  3. (C)Arteries
  4. (D)Veins

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/2/1.

Hints

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

Hint 1

Which vessels allow exchange of materials between blood and the surrounding cells?

Hint 2

Note that alveoli are not blood vessels.

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 and veins have thick, layered walls. Alveoli are air sacs in the lungs, not blood vessels.

  2. The smallest blood vessels have walls only one cell thick, which lets materials be exchanged with the tissues. These are the capillaries: (B).

    1 mark

Answer: (B) Capillaries

Where the marks are

  • Identifies capillaries, option (B) (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 31/2/1: 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.