Waec Model Questions Vol1 2025 Biology Question 4

A student set up an experiment to investigate the effect of temperature on the rate of respiration in yeast. The student prepared a glucose solution and added yeast to it. The setup included a test tube filled with the mixture, a water bath to maintain different temperatures, and a manometer to measure the volume of carbon dioxide produced. The experiment was conducted at 10°C, 20°C, 30°C, 40°C, and 50°C. After 30 minutes, the volume of carbon dioxide produced at each temperature was recorded as follows: | Temperature (°C) | Volume of CO2 produced (cm³) | |-------------------|------------------------------| | 10 | 5 | | 20 | 15 | | 30 | 30 | | 40 | 25 | | 50 | 10 | (a) Plot a graph of temperature against the volume of carbon dioxide produced. (b) Describe the trend shown in the graph and explain the biological significance of the observed trend. (c) Identify one limitation of this experiment and suggest how it could be improved.