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CAIE A-Level Biology 12.1.5 Respiratory Quotient

Practise calculating RQ as CO₂ produced divided by O₂ consumed and interpreting values near one, seven-tenths or intermediate values as carbohydrate, lipid or mixed use.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • write RQ as carbon-dioxide production divided by oxygen consumption in respiration
  • calculate the dimensionless ratio from comparable gas volumes or mole amounts
  • interpret values using carbohydrate, lipid or mixed-substrate respiration evidence

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