A) fat
B) sucrose
C) glucose
D) organic acid
Correct Answer: D
Solution :
Organic acid evolves more \[\text{C}{{\text{O}}_{\text{2}}}\]than volume of oxygen consumed when broken down as respiratory substrate under aerobic conditions i.e., R.Q. is more than unity \[\underset{\text{Oxalic}\,\text{acid}}{\mathop{2{{(COOH)}_{2}}+}}\,{{O}_{2}}\xrightarrow{{}}4C{{O}_{2}}+2{{H}_{2}}O\] \[R.Q=4C{{O}_{2}}/1{{O}_{2}}=4\] Fat evolves less CO 2 than volume of oxygen absorbed, e.g., germination of fatty seeds. R.Q. is less than one (mostly 0.7) under aerobic respiration of fats. \[\underset{\text{eriolein}}{\mathop{{{C}_{57}}\,{{H}_{104}}\,{{O}_{6}}}}\,+\,80\,{{O}_{2}}\xrightarrow{{}}57C{{O}_{2}}+52{{H}_{2}}O\] \[R.Q=\frac{57C{{O}_{2}}}{80\,{{O}_{2}}}=0.71.\] Carbohydrates (sucrose, glucose etc.) produce carbondioxide equal to oxygen consumed, under aerobic conditions. i.e., \[\text{ }\!\!~\!\!\text{ R}\text{.Q}\text{.=}\,\text{1}\] \[{{C}_{6}}{{H}_{12}}{{O}_{6}}+6\,{{O}_{2}}\xrightarrow{{}}6C{{O}_{2}}+6{{H}_{2}}O\] \[R.Q.=6C{{O}_{2}}/6\,{{O}_{2}}=1\] While, under anaerobic conditions, carbohydrates evolves\[\text{C}{{\text{O}}_{\text{2}}}\]without consuming \[{{\text{O}}_{\text{2}}}\text{.R}\text{.Q}\text{.}\]is infinity. \[{{C}_{6}}{{H}_{12}}{{O}_{6}}\xrightarrow{\text{zymase}}2\,C{{O}_{2}}+{{C}_{2}}{{H}_{5}}OH\] \[R.Q.=\frac{2C{{O}_{2}}}{zero\,{{O}_{2}}}=\text{Infinity}\]
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