Question Bank • QB_APE_STOR_011 MCQ • 1 Mark

Section 6: Agricultural Process Engineering

Storage Systems

Subtopic: Controlled and modified atmosphere storage

Question Statement:

The Respiratory Quotient ($RQ$) of stored fresh produce is defined as the volumetric ratio of $CO_2$ produced to $O_2$ consumed. For stored produce utilizing primarily carbohydrate substrates under normal aerobic respiration, the theoretical $RQ$ value is:

Options:

  • (A) 1.0
  • (B) 0.7
  • (C) 1.33
  • (D) 0.0

Answer Key:

A

Step-by-Step Solution & Explanation

Complete aerobic oxidation of glucose follows: $C_6H_{12}O_6 + 6 O_2 \to 6 CO_2 + 6 H_2O$. Thus, $RQ = \frac{6\text{ moles } CO_2}{6\text{ moles } O_2} = 1.0$. (Lipid oxidation yields $RQ \approx 0.7$, while organic acid oxidation yields $RQ > 1.0$).
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