What is true about RBCs in humans?

(A)They carry about 20-25 percent of CO2.
(B)They transport 99.5 percent of O2.
(C)They transport about 80 percent oxygen only and the rest 20 percent of it is transported in dissolved state in blood plasma.
(D)They do not carry CO2 at all.

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=1.0, combined=1.0). Verified: high — The span explicitly states 'Nearly 20-25 per cent of CO2 is transported by RBCs', which directly matches option A and distinguishes it from the incorrect options.

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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 2010 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.