Waec Model Questions Vol1 2018 Biology Question 4

Students examined the effect of temperature on the rate of respiration in germinating beans using a closed respirometer. Ten germinating Phaseolus vulgaris beans were placed in the respirometer, which was filled with 50 mL of water and sealed. The change in gas volume (decrease due to CO₂ uptake) was recorded over 5 minutes at three different water‑bath temperatures as shown: | Temperature (°C) | Volume decrease (mL) in 5 min | |------------------|--------------------------------| | 15 | 4.0 | | 25 | 9.0 | | 35 | 15.0 | Assume the gas behaves ideally and that the volume change is solely due to CO₂ produced by respiration. Answer the following: