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Which of the following… (Class 10 Science SQP 2024-25, Q16)

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

CBSE Class 10 Science sample paper 2024-25: question 16

From the official CBSE sample question paper for 2024-25, section A, question 16, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q16 · 1 mark · MCQOur Environment

Which of the following is not a role of decomposers in the ecosystem?

  1. (A)Natural replenishment of soil.
  2. (B)Enrichment of oxygen in atmosphere.
  3. (C)Waste decomposition.
  4. (D)Break-down of dead remains.

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 do bacteria and fungi do to dead matter?

Hint 2

Which organisms release oxygen?

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. Decomposers break down dead remains and wastes and return nutrients to the soil.

    ½ mark

  2. They do not produce oxygen; it is added to the atmosphere by photosynthesis. The answer is option (B).

    ½ mark

Answer: Enrichment of oxygen in atmosphere; option (B)

Where the marks are

  • Recognises that decomposers do not add oxygen to the atmosphere (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.