A) 1
B) 4
C) 0
D) \[\infty \]
Correct Answer: C
Solution :
Respiratory Quotient (\[\text{RQ}\]) is the ratio of the volume of \[C{{O}_{2}}\] released to the volume of oxygen taken in respiration and is written as \[\text{RQ=}\frac{\text{Volume}\,\text{of}\,\text{C}{{\text{O}}_{\text{2}}}\,\text{evolved}\,}{\text{Volume}\,\text{of}\,{{\text{O}}_{\text{2}}}\,\text{absorbed}}\text{=}\frac{\text{C}{{\text{O}}_{\text{2}}}}{{{\text{O}}_{\text{2}}}}\] In succulents like Opuntia, Bryophyllum where there is incomplete oxidation of carbohydrates no CO 2 is produced, hence the value of RQ is zero \[\begin{align} & \text{2}{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{12}}}{{\text{O}}_{\text{6}}}\text{+3}{{\text{0}}_{\text{2}}}\xrightarrow{{}}\text{3}{{\text{C}}_{\text{4}}}{{\text{H}}_{\text{6}}}{{\text{O}}_{\text{5}}}\text{+3}{{\text{H}}_{\text{2}}}\text{O} \\ & \frac{\text{C}{{\text{O}}_{\text{2}}}}{{{\text{O}}_{\text{2}}}}\text{=}\frac{\text{O}}{\text{3}}\text{=0}\,\text{(zero)} \\ \end{align}\]
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