NEET 2019 · Class 11

Breathing and Exchange of Gases

Select the correct statement.

  1. (A)Expiration is initiated due to contraction of diaphragm.
  2. (B)Expiration occurs due to external intercostal muscles.
  3. (C)Intrapulmonary pressure is lower than the atmospheric pressure during inspiration.
  4. (D)Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure.

The NCERT line that answers it

Verbatim line

Inspiration can occur if the pressure within the lungs (intra-pulmonary pressure) is less than the atmospheric pressure, i.e., there is a negative pressure in the lungs with respect to atmospheric pressure.

Chapter
Breathing and Exchange of Gases
Section
14.2 MECHANISM OF BREATHING
Page
4
Words matched
31 of 31

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

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states 'Inspiration can occur if the pressure within the lungs (intra-pulmonary pressure) is less than the atmospheric pressure', which directly matches and proves option C's claim that intrapulmonary pressure is lower than atmospheric pressure during inspiration.

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Question text is reproduced from the published NEET 2019 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.