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Respiration In Plants — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYRespiration In Plants2 Marks
Question
When is RQ slightly more than unity?
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Answer

RQ slightly more than unity is found when organic acids are broken down as respiratory substrates under aerobic conditions, e.g.,
$2\big(\text{COOH}\big)_2+\text{O}_2\rightarrow4\text{CO}_2+2\text{H}_2\text{O}$
Oxalic acid:
$\text{RQ}=\frac{4\text{CO}_2}{1\text{O}_2}=4.0$
$\text{C}_4\text{H}_6\text{O}_5+3\text{O}_2\rightarrow4\text{CO}_2+3\text{H}_2\text{O}$
Malic acid:
$\text{RO}=\frac{4\text{CO}_2}{3\text{O}_2}=1.3$

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