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A food chain will be more… (Class 10 Science 2024, Q15)

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ScienceCBSE Class 10 · Board exam 2024, set 31/3/1 · 1 mark · MCQ

CBSE Class 10 Science 2024: question 15

Set in the CBSE Class 10 board exam of 2024, paper 31/3/1, 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

A food chain will be more advantageous in terms of energy if it has

  1. (A)2 trophic levels
  2. (B)3 trophic levels
  3. (C)4 trophic levels
  4. (D)5 trophic levels

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/3/1.

Hints

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

Hint 1

Recall the 10 percent law.

Hint 2

Energy is lost at each step. Do you want more steps or fewer?

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. By the 10% law, only about 10% of the energy passes to the next trophic level. The rest is lost at every step.

  2. The fewer the trophic levels, the more energy reaches the top. So a chain with 2 trophic levels is most advantageous. Option (A).

    1 mark

Answer: 2 trophic levels, option (A)

Where the marks are

  • Chooses 2 trophic levels using the 10% energy law (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 paper2024 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.