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Answer the following. (Class 10 Science 2026, Q10)

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ScienceCBSE Class 10 · Board exam 2026, set 31/3/1 · 2 marks · Very short answer

CBSE Class 10 Science 2026: question 10

Set in the CBSE Class 10 board exam of 2026, paper 31/3/1, section A, question 10, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q10 · 2 marks · Very short answerOur Environment

Answer the following.

  1. (i)

    Chlorofluorocarbons (CFCs) have been linked to depletion of ozone layer. In 1987, the United Nations Environment Programme (UNEP) succeeded in making an agreement. State this agreement.

    0 marks
  2. (ii)

    What is the role of ozone in our atmosphere ?

    0 marks

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 31/3/1.

Hints

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

Hint 1

The agreement put a cap on how much CFC could be made, linked to a particular earlier year.

Hint 2

For (ii), think about which harmful radiation from the Sun the ozone layer stops from reaching us.

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. (i) Under the 1987 UNEP agreement (the Montreal Protocol), countries agreed to freeze the production of CFCs at the 1986 levels.

    1 mark

  2. (ii) Ozone () in the upper atmosphere absorbs the harmful ultraviolet (UV) radiation from the Sun. It shields living beings on the Earth's surface from UV damage such as skin cancer.

    1 mark

Answer: (i) Freeze CFC production at 1986 levels; (ii) Ozone shields the Earth from harmful UV radiation of the Sun.

Where the marks are

  • States the agreement to freeze CFC production at 1986 levels (1 mark)
  • States that ozone shields the Earth's surface from harmful UV radiation (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 paper2026 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.