Neco 2022 Biology Question 4

Students investigated the effect of temperature on the rate of respiration in germinating peas using a closed respirometer. Five grams of germinated peas were placed in a sealed 250 mL respirometer containing 5 mL of 0.1 M KOH solution to absorb CO₂. The respirometer was immersed in water baths at 15 °C, 25 °C and 35 °C. The volume of water displaced (which equals the volume of O₂ consumed) was recorded every 5 minutes for a total of 30 minutes. The recorded displacements are:\n\n15 °C: 0, 0.8, 1.5, 2.2, 3.0, 3.7, 4.5 mL\n25 °C: 0, 1.2, 2.5, 3.9, 5.4, 6.9, 8.5 mL\n35 °C: 0, 1.8, 3.7, 5.6, 7.8, 10.0, 12.5 mL\n\n(Measurements are taken at 0, 5, 10, 15, 20, 25 and 30 min).