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Assertion (A) : Natural… (Class 10 Science 2026, Q8)

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

CBSE Class 10 Science 2026: question 8

Set in the CBSE Class 10 board exam of 2026, paper 31/3/1, section A, question 8, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q8 · 1 mark · Assertion-reasonCompetency-basedOur Environment

Assertion (A) : Natural replenishment of soil will not take place in absence of microbes.
Reason (R) : Microbes, comprising of bacteria and fungi, break down dead remains and waste products of organisms, and they go into the soil.

  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

What role do decomposers play in an ecosystem?

Hint 2

Check whether R gives the reason for A.

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 dead matter into simple substances that return to the soil and replenish it. Without them this recycling would stop, so A is true.

  2. R is true and explains why A happens. Option (A).

    1 mark

Answer: (A)

Where the marks are

  • Both true and R explains A (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 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.