Skip to content

What is the function of… (Class 10 Science 2026, Q10)

questionbuddy.in/q/cbse-10-science-2026-31-1-1-q10-function-diaphragm-human-respiratory-system

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

CBSE Class 10 Science 2026: question 10

Set in the CBSE Class 10 board exam of 2026, paper 31/1/1, 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 answerLife Processes

What is the function of diaphragm in human respiratory system? Where is it present in human body?

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

What happens to the volume of the chest cavity when you breathe in?

Hint 2

This muscle separates the chest from the abdomen.

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. Function: during inhalation the diaphragm contracts and flattens. This increases the volume of the chest cavity, so air is drawn into the lungs. During exhalation it relaxes and pushes air out. It therefore helps in breathing.

    1 mark

  2. Location: it is a dome-shaped muscular sheet at the base (floor) of the chest cavity. It separates the chest cavity from the abdominal cavity.

    1 mark

Answer: It flattens during inhalation to enlarge the chest cavity and draw air into the lungs (helps breathing); it lies at the base of the chest cavity.

Where the marks are

  • States the role of the diaphragm in breathing (flattens, chest cavity expands, air drawn in) (1 mark)
  • States it is at the base of the chest cavity (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.