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The following events occur… (Class 10 Science 2026, Q5)

questionbuddy.in/q/cbse-10-science-2026-31-2-1-q5-events-occur-during-process-photosynthesis

ScienceCBSE Class 10 · Board exam 2026, set 31/2/1 · 1 mark · MCQ

CBSE Class 10 Science 2026: question 5

Set in the CBSE Class 10 board exam of 2026, paper 31/2/1, section A, question 5, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q5 · 1 mark · MCQLife Processes

The following events occur during the process of photosynthesis. Choose the option that indicates the correct events.

(i) Oxidation of carbon dioxide to carbohydrates
(ii) Conversion of light energy into chemical energy
(iii) Absorption of light energy by chlorophyll
(iv) Conversion of hydrogen and oxygen into water

  1. (A)(i) and (ii)
  2. (B)(ii) and (iii)
  3. (C)(iii) and (iv)
  4. (D)(i) and (iv)

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 31/2/1.

Hints

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

Hint 1

Is CO2 oxidised or reduced in photosynthesis?

Hint 2

Water is split, not made.

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. In photosynthesis, chlorophyll absorbs light energy and converts it into chemical energy, so (ii) and (iii) are correct.

  2. Statement (i) is wrong because is reduced, not oxidised, to carbohydrate. Statement (iv) is wrong because water is split, not formed. Option (B).

    1 mark

Answer: (ii) and (iii), option (B)

Where the marks are

  • Selects (ii) and (iii) (1 mark)

Revise the chapter

  • Chapter: Life Processes (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Life Processes, one at a time, marked against the answer key and marking points.Back to the full paper2026 board paper, set 31/2/1: 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.