R.Q. is ratio of (1990)

(A)CO2 produced to substrate consumed
(B)CO2 produced to O2 consumed
(C)oxygen consumed to water produced
(D)oxygen consumed to CO2 produced

The NCERT line that answers it

Verbatim line

The ratio of the volume of CO<sub>2</sub> evolved to the volume of O<sub>2</sub> consumed in respiration is called the **respiratory quotient (RQ)** or respiratory ratio.

Chapter: Respiration in Plants
Section: 12.7 Respiratory Quotient

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 'The ratio of the volume of CO2 evolved to the volume of O2 consumed in respiration is called the respiratory quotient (RQ)', which directly matches option B and distinguishes it from all other options.

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