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Identify the incorrect… (Class 10 Science SQP 2024-25, Q15)

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ScienceCBSE Class 10 · Sample paper, session 2024-25 · 1 mark · MCQ

CBSE Class 10 Science sample paper 2024-25: question 15

From the official CBSE sample question paper for 2024-25, 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

Identify the incorrect statement
'The energy available to the producers is maximum' because:

  1. (A)It is the first trophic level which absorbs1% of light energy directly from the source.
  2. (B)It utilizes the most of the chemical energy for its own respiration, growth, reproduction, movement etc.
  3. (C)It utilizes 10% of light energy and transfers the rest to the next trophic level.
  4. (D)It transfers only 10% of light energy to the next trophic level.

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2024-25.

Hints

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

Hint 1

Recall the 10% law of energy transfer.

Hint 2

Do producers keep most of their energy or pass most of it on?

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. Producers capture about 1% of sunlight. They use most of this energy for their own life processes and pass only about 10% on to the next trophic level (the 10% law).

    ½ mark

  2. Statement (C) says producers use 10% and transfer the rest, which reverses the 10% law. So (C) is the incorrect statement.

    ½ mark

Answer: Option (C)

Where the marks are

  • Applies the 10% law to spot the reversed statement (C) (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 2024-25: 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.