NEET 2012 · Class 11

Breathing and Exchange of Gases

Which one of the following is the correct statement for respiration in humans? (2012)

  1. (A)Cigarette smoking may lead to inflammation of bronchi.
  2. (B)Neural signals from pneumotoxic centre in pons region of brain can increase the duration of inspiration.
  3. (C)Workers in grinding and stone-breaking industries may suffer, from lung fibrosis.
  4. (D)About 90% of carbon dioxide (CO2) is carried by haemoglobin as carbaminohaemoglobin

The NCERT line that answers it

Verbatim line

In certain industries, especially those involving grinding or stone-breaking, so much dust is produced that the defense mechanism of the body cannot fully cope with the situation.

Chapter
Breathing and Exchange of Gases
Section
14.6 DISORDERS OF RESPIRATORY SYSTEM
Page
10
Words matched
47 of 47

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 that workers in grinding or stone-breaking industries may develop fibrosis from dust exposure, which directly matches option C.

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Every one traced to the exact sentence in NCERT that answers it, including 90% of the 2026 paper. Sit a mock on the real NEET 2027 computer interface and every mark you drop comes back with its line attached.

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Question text is reproduced from the published NEET 2012 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.