NEET 1995 · Class 11

Breathing and Exchange of Gases

The ventilation movements of the lungs in mammals are governed by

  1. (A)muscular walls of lung
  2. (B)diaphragm
  3. (C)costal muscles
  4. (D)both (b) and (c)

The NCERT line that answers it

Verbatim line

Inspiration and expiration are carried out by creating pressure gradients between the atmosphere and the alveoli with the help of specialised muscles – intercostals and diaphragm.

Chapter
Breathing and Exchange of Gases
Section
intro EXERCISES
Page
10
Words matched
25 of 25

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

6667, emb=0.8071, combined=0.7509). Verified: high — The span explicitly states that inspiration and expiration are carried out with the help of 'intercostals and diaphragm', which directly corresponds to options B (diaphragm) and C (costal muscles), making D the correct answer.

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Question text is reproduced from the published NEET 1995 paper for study and commentary. NCERT text is quoted, not redistributed; textbooks remain at ncert.nic.in. Our mapping method, including its measured error rates, is published at /methodology.