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Which structure in a leaf is… (Class 10 Science 2026, Q1)

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

CBSE Class 10 Science 2026: question 1

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

Q1 · 1 mark · MCQLife Processes

Which structure in a leaf is mainly responsible for gaseous exchange?

  1. (A)Xylem
  2. (B)Stomata
  3. (C)Phloem
  4. (D)Cuticle

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

Hints

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

Hint 1

Think of the tiny pores seen on a leaf peel under the microscope.

Hint 2

These pores are bordered by guard cells.

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. Gaseous exchange in a leaf ( in, out during photosynthesis) happens through tiny pores on the leaf surface. These pores are the stomata, and guard cells open and close them.

  2. Xylem carries water and phloem carries food. The cuticle is a waxy layer that cuts down water loss. None of these exchanges gases. Correct option: (B) Stomata.

    1 mark

Answer: (B) Stomata

Where the marks are

  • Chooses (B) Stomata (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 31/1/1: 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.