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Assertion (A): If the… (Class 10 Science SQP 2024-25, Q20)

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ScienceCBSE Class 10 · Sample paper, session 2024-25 · 1 mark · Assertion-reason

CBSE Class 10 Science sample paper 2024-25: question 20

From the official CBSE sample question paper for 2024-25, section A, question 20, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q20 · 1 mark · Assertion-reasonCompetency-basedOur Environment

Assertion (A): If the lions are removed from a food chain it will not affect the food chain, however if the plants are removed from a food chain it will disturb the ecosystem.
Reason (R): Plants are producers who can make food using sunlight, while lions are consumers.

  1. (A)Both A and R are true, and R is the correct explanation of A.
  2. (B)Both A and R are true, and 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 sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2024-25.

Hints

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

Hint 1

What would happen to deer numbers if lions disappeared?

Hint 2

Is the statement about producers and consumers correct?

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. Removing the lions (top consumers) would let herbivore numbers rise, which would overgraze the plants. The food chain would be affected, so A is false.

    ½ mark

  2. Plants are producers that make food using sunlight, and lions are consumers. R is true. The answer is option (D).

    ½ mark

Answer: A is false but R is true; option (D)

Where the marks are

  • Identifies A as false (removing any level disturbs the chain) and R as true (1 mark)

Revise the chapter

  • Chapter: Our Environment (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Our Environment, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2024-25: 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.