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Respiration In Plants — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYRespiration In Plants3 Marks
Question
Different substrates get oxidized during respiration. How does Respiratory Quotient (RQ) indicate which type of substrate, i.e., carbohydrate, fat or protein is getting oxidized? $\text{R}.\text{Q}=\frac{\text{A}}{\text{B}}$ What do A and B stand for? What type of substrates have R.Q. of 1, < 1 or > 1?
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Answer

The ratio of $\mathrm{CO}_2$ evolved and consumption of $\mathrm{O}_2$ in respiration is called the Respiratory Quotient (RQ) or respiratory ratio. $\text{R}.\text{Q}=\frac{\text{A}}{\text{B}}=\frac{\text{Volume of}\ \text{CO}_2\text{Evolved}}{\text{Volume of}\ \text{O}_2\text{Consumed}}$ Substrates like carbohydrates have RQ =1 during, aerobic respiration. Proteins and fats have RQ of < 1 and it occurs during germination of seeds. Substrates like organic acids have RQ of > 1 under aerobic conditions.

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