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Assertion: Biodegradabl… (Class 10 Science SQP 2023-24, Q20)

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ScienceCBSE Class 10 · Sample paper, session 2023-24 · 1 mark · Assertion-reason

CBSE Class 10 Science sample paper 2023-24: question 20

From the official CBSE sample question paper for 2023-24, 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: Biodegradable substances result in the formation of compost and natural replenishment.
Reason: It is due to breakdown of complex inorganic substances into simple organic substances.

  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 2023-24.

Hints

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

Hint 1

Check the direction of the breakdown stated in R.

Hint 2

Decomposers convert dead matter into which kind of substances?

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 biodegradable waste into compost and return nutrients to the soil. The Assertion is true.

  2. Decomposers break complex organic substances into simple inorganic substances, not the other way round. The Reason is false, so the answer is option (C).

    1 mark

Answer: Option (C)

Where the marks are

  • A true; R false because the breakdown is organic → inorganic (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 2023-24: 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.