A) One
B) Two
C) Zero
D) Less than one
Correct Answer: D
Solution :
Respiratory Quotient (RQ) is defined as the volume of \[C{{O}_{2}}\] released to volume of \[{{O}_{2}}\] absorbed in the respiratory process. RQ of fats and proteins or seeds, in which the stored food is oil is less than one. \[2{{C}_{51}}{{H}_{98}}{{O}_{6}}+145{{O}_{2}}\xrightarrow{{}}102C{{O}_{2}}+98{{H}_{2}}O\] \[RQ=\frac{C{{O}_{2}}}{{{O}_{2}}}=\frac{102}{145}=0.7\] RQ is one in case of Carbohydrate \[{{C}_{6}}{{H}_{12}}{{O}_{6}}+6{{O}_{2}}\to 6C{{O}_{2}}+6{{H}_{2}}O+686\] kcal \[RQ=\frac{C{{O}_{2}}}{{{O}_{2}}}=\frac{6}{6}=1\] RQ is zero in succulent leaves In succulents and red leaves, incomplete oxidation of carbohydrates takes place in dark without the evolution of \[C{{O}_{2}}\], eg, Opuntia. \[2{{C}_{6}}{{H}_{12}}{{O}_{6}}+3{{O}_{2}}\xrightarrow{{}}\underset{\left( malic\text{ }acid \right)}{\mathop{3{{C}_{4}}{{H}_{6}}{{O}_{5}}}}\,+3{{H}_{2}}\] \[RQ=\frac{C{{O}_{2}}}{{{O}_{2}}}=\frac{0}{3}=0\]
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