The majority of carbon dioxide produced by our body cells is transported to the lungs as (2006)

(A)attached to haemoglobin
(B)dissolved in the blood
(C)as bicarbonates
(D)as carbonates

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

0, emb=0.9991, combined=0.9995). Verified: high — The span explicitly states that 70% of CO2 is transported as bicarbonate, which directly answers the question about the majority transport mechanism.

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Question text is reproduced from the published NEET 2006 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.