The carbon dioxide is transported via blood to lungs mostly (1995)

(A)in combination with haemoglobin only
(B)dissolved in blood plasma
(C)in the form of bicarbonate ions
(D)as carbaminohaemoglobin and as carbonic acid

The NCERT line that answers it

Verbatim line

Nearly 20-25 per cent of $CO_2$ is transported by RBCs whereas 70 per cent of it is carried as bicarbonate.

Chapter: Breathing and Exchange of Gases
Section: 14.4 TRANSPORT OF GASES

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

How this line gives the answer

5, emb=0.9508, combined=0.7705). Verified: high — The span explicitly states that 70% of CO2 is transported as bicarbonate, which directly matches and proves option C as 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.