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The percentage of solar… (Class 10 Science 2025, Q16)

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

CBSE Class 10 Science 2025: question 16

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

Q16 · 1 mark · MCQOur Environment

The percentage of solar energy which is not converted into food energy by the leaves of green plants in a terrestrial ecosystem is about:

  1. (A)1%
  2. (B)10%
  3. (C)90%
  4. (D)99%

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

Hints

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

Hint 1

Recall what percentage of sunlight producers capture.

Hint 2

The question asks for the part that is NOT converted.

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. Green plants convert only about 1% of the sunlight falling on their leaves into food energy.

  2. So about is not converted. The answer is option (D).

    1 mark

Answer: 99%, option (D)

Where the marks are

  • Chooses option (D) (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 31/1/1: 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.