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In the food chains given… (Class 10 Science 2025, Q15)

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ScienceCBSE Class 10 · Board exam 2025, set 31/4/1 · 1 mark · MCQ

CBSE Class 10 Science 2025: question 15

Set in the CBSE Class 10 board exam of 2025, paper 31/4/1, section A, question 15, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q15 · 1 mark · MCQOur Environment

In the food chains given below. Select the most efficient food chain in terms of energy :

  1. (A)Grass → Grasshopper → Frog → Snake
  2. (B)Plants → Deer → Lion
  3. (C)Plants → Man
  4. (D)Phytoplankton → Zooplankton → Small Fish → Big Fish

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/4/1.

Hints

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

Hint 1

Energy is lost at each step of a food chain.

Hint 2

Choose the chain with the fewest steps.

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. Only about 10% of energy passes from one trophic level to the next, so the fewer the levels, the more energy is available at the top.

  2. Plants → Man has only two trophic levels, so it loses the least energy. Option (C).

    1 mark

Answer: (C) Plants → Man

Where the marks are

  • Shortest food chain is most efficient (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 paper2025 board paper, set 31/4/1: 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.