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Assertion (A): The inner… (Class 10 Science 2023, Q19)

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ScienceCBSE Class 10 · Board exam 2023, set 31/4/1 · 1 mark · Assertion-reason

CBSE Class 10 Science 2023: question 19

Set in the CBSE Class 10 board exam of 2023, paper 31/4/1, section A, question 19, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q19 · 1 mark · Assertion-reasonCompetency-basedLife Processes

Assertion (A): The inner walls of the small intestine have finger like projections called villi which are rich in blood.

Reason (R): These villi have a large surface area to help the small intestine in completing the digestion of food.

  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.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 31/4/1.

Hints

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

Hint 1

What happens to digested food in the small intestine?

Hint 2

Is the large surface area for digestion or for absorption?

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. Villi are finger-like projections that are richly supplied with blood vessels, so A is true.

  2. Their large surface area is for the absorption of digested food, not for completing digestion. So R is false, and option (C) is correct.

    1 mark

Answer: Option (C)

Where the marks are

  • A true, R false because villi aid absorption (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 paper2023 board paper, set 31/4/1: 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.