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Other than the abiotic… (Class 10 Science 2025, Q16)

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ScienceCBSE Class 10 · Board exam 2025, set 31/3/1 · 1 mark · MCQ

CBSE Class 10 Science 2025: question 16

Set in the CBSE Class 10 board exam of 2025, paper 31/3/1, section A, question 16, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q16 · 1 mark · MCQCompetency-basedOur Environment

Other than the abiotic components, which of the given biotic components are not required to make an aquarium with small herbivorous fishes a self-sustaining system?

(i) Aquatic plants and aquatic animals
(ii) Terrestrial plants and terrestrial animals
(iii) Decomposers as bacteria and fungi
(iv) Consumers as clown fishes and sea urchins

  1. (A)(i) and (iv)
  2. (B)(ii) and (iii)
  3. (C)(i) and (iii)
  4. (D)(ii) and (iv)

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/3/1.

Hints

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

Hint 1

Think of producers, consumers and decomposers.

Hint 2

Which organisms do not belong in a freshwater aquarium?

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. A self-sustaining aquarium needs aquatic plants and animals and decomposers.

    ½ mark

  2. Terrestrial organisms are not needed. Clown fishes and sea urchins are marine organisms and are not required for small herbivorous fishes. Hence (ii) and (iv) are not required.

    ½ mark

Answer: Option (D), (ii) and (iv)

Where the marks are

  • Selects (ii) and (iv) (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Our Environment, one at a time, marked against the answer key and marking points.Back to the full paper2025 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.