The partial pressure of oxygen in the alveoli of the lungs is (NEET II 2016)

(A)equal to that in the blood
(B)more than that in the blood
(C)less than that in the blood
(D)less than that of carbon dioxide.

The NCERT line that answers it

Verbatim line

In the alveoli where $pO_2$ is higher, $O_2$ gets bound to haemoglobin which is easily dissociated at the tissues where $pO_2$ is low and $pCO_2$ and $H^+$ concentration are high.

Chapter: Breathing and Exchange of Gases
Section: intro EXERCISES

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

How this line gives the answer

6667, emb=0.8564, combined=0.7805). Verified: high — The span explicitly states 'In the alveoli where pO₂ is higher' and contrasts this with tissues where pO₂ is low, which directly establishes that alveolar pO₂ is higher than in blood (which comes from tissues), making option B conclusively correct.

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Question text is reproduced from the published NEET 2016 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.