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In human respiratory system… (Class 10 Science 2024, Q10)

questionbuddy.in/q/cbse-10-science-2024-31-2-1-q10-human-respiratory-system-person-breathes

ScienceCBSE Class 10 · Board exam 2024, set 31/2/1 · 1 mark · MCQ

CBSE Class 10 Science 2024: question 10

Set in the CBSE Class 10 board exam of 2024, paper 31/2/1, section A, question 10, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q10 · 1 mark · MCQLife Processes

In human respiratory system, when a person breathes in, the position of ribs and diaphragm will be :

  1. (A)lifted ribs and curve/dome shaped diaphragm.
  2. (B)lifted ribs and flattened diaphragm.
  3. (C)relaxed ribs and flattened diaphragm.
  4. (D)relaxed ribs and curve/dome shaped diaphragm.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/2/1.

Hints

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

Hint 1

To breathe in, the chest cavity must become larger.

Hint 2

What happens to the dome-shaped diaphragm when it contracts?

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. During inhalation the rib muscles lift the ribs and the diaphragm contracts and flattens.

    ½ mark

  2. This enlarges the chest cavity, so air rushes into the lungs. Option (B) is correct.

    ½ mark

Answer: Lifted ribs and flattened diaphragm: option (B)

Where the marks are

  • Selects option (B) (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 paper2024 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.