NEET 2014 · Class 11

Breathing and Exchange of Gases

Approximately seventy percent of carbon-dioxide absorbed by the blood will be transported to the lungs

  1. (A)as bicarbonate ions
  2. (B)in the form of dissolved gas molecules
  3. (C)by binding to R.B.C
  4. (D)as carbamino - haemoglobin

The NCERT line that answers it

Verbatim line

Nearly 70 per cent of carbon dioxide is transported as bicarbonate ( $HCO_3^-$ ) with the help of the enzyme carbonic anhydrase.

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=0.8735, combined=0.7907). Verified: high — The span explicitly states 'Nearly 70 per cent of carbon dioxide is transported as bicarbonate', which directly matches both the percentage (70%) and the transport mechanism (bicarbonate ions) specified in the question and correct answer.

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