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Assertion (A) : The basic… (Class 10 Science 2026, Q9)

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ScienceCBSE Class 10 · Board exam 2026, set 31/3/1 · 1 mark · Assertion-reason

CBSE Class 10 Science 2026: question 9

Set in the CBSE Class 10 board exam of 2026, paper 31/3/1, section A, question 9, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q9 · 1 mark · Assertion-reasonCompetency-basedLife Processes

Assertion (A) : The basic filtration unit in the kidneys, like in the lungs, is a cluster of very thin-walled blood capillaries.
Reason (R) : Each capillary cluster in the kidney is associated with the cup-shaped end of a coiled tube called Bowman’s capsule.

  1. (A)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
  2. (B)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
  3. (C)Assertion (A) is true, but Reason (R) is false.
  4. (D)Assertion (A) is false, but Reason (R) is true.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 31/3/1.

Hints

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

Hint 1

Check each statement separately against what you know about the nephron.

Hint 2

Does R give the reason for A, or is it just another fact?

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. The glomerulus, a cluster of thin-walled capillaries, is the filtering unit, just as the alveolar capillaries are in the lungs. So A is true. R correctly describes Bowman's capsule, so R is also true.

  2. R only describes the structure of the nephron; it does not explain why the filtering unit is a capillary cluster. Option (B).

    1 mark

Answer: (B)

Where the marks are

  • Both true, but R is not the explanation of A (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 paper2026 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.