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Assertion (A): Amoeba takes… (Class 10 Science 2023, Q19)

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ScienceCBSE Class 10 · Board exam 2023, set 31/6/1 · 1 mark · Assertion-reason

CBSE Class 10 Science 2023: question 19

Set in the CBSE Class 10 board exam of 2023, paper 31/6/1, 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): Amoeba takes in food using finger like extensions of the cell surface.

Reason (R): In all unicellular organisms, the food is taken in by the entire cell surface.

  1. (A)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of (A).
  2. (B)Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of (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 2023 board paper, set 31/6/1.

Hints

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

Hint 1

How does Amoeba capture food?

Hint 2

Think about how Paramecium feeds.

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. Assertion is true: Amoeba engulfs food using pseudopodia, which are finger-like extensions of the cell surface.

    ½ mark

  2. Reason is false: not all unicellular organisms take in food through the whole surface; Paramecium, for example, takes food in at a specific spot. Hence the answer is option (C).

    ½ mark

Answer: Option (C)

Where the marks are

  • A true, R false (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 31/6/1: 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.