Sample Questions — Respiratory Quotient
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MCQ
An RQ of greater than 1 suggests:
✅ Correct Answer: C
Organic acids already contain oxygen and release more COâ‚‚ than Oâ‚‚ consumed.
MCQ
Why are pure fats or proteins rarely used as the sole respiratory substrates in living organisms?
✅ Correct Answer: D
Real cellular respiration involves a mix of carbs, fats, and proteins.
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MCQ
In anaerobic fermentation (e.g., to ethanol), RQ is:
✅ Correct Answer: A
Equal amounts of CO₂ are produced with no O₂ consumed; for glucose, RQ = CO₂/0 → infinite; but some sources take RQ = 1 by default for fermentation.
MCQ
Why is RQ undefined in anaerobic respiration?
✅ Correct Answer: A
RQ = CO₂/O₂ → division by zero = undefined.
MCQ
Which of the following may show fluctuating RQ values during different times of the day in CAM plants?
✅ Correct Answer: D
CAM plants like succulents use organic acids → RQ > 1, but timing varies.
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