CAIE A-Level Biology A2 12.1.7 Respirometer Investigations Questions

For an RQ investigation, measure oxygen uptake with carbon dioxide absorbed, repeat under matched conditions without absorbent, and use the difference to obtain carbon-dioxide output. Keep time, temperature and pressure controlled.

Exam points

Plan paired respirometer measurements with and without a carbon-dioxide absorbent to determine oxygen uptake, carbon-dioxide output and respiratory quotient.
Identify a respirometer as the apparatus used to determine RQ in germinating seeds or small invertebrates.
Use potassium hydroxide, sodium hydroxide or soda lime to absorb carbon dioxide when measuring oxygen uptake for an RQ investigation.

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