Waec Model Questions Vol1 2018 Biology Question 3

A group of students investigated the effect of glucose concentration on the rate of respiration in yeast. Fresh baker's yeast (5 g) was added to 100 mL of glucose solutions of different concentrations (0%, 5%, 10% and 15% w/v) in separate sealed respirometers kept in a water bath at 30 °C. The volume of carbon dioxide collected in the graduated tube was recorded after 10 minutes for each concentration as shown in the table below. | Glucose concentration (%) | CO₂ collected (mL) | |----------------------------|--------------------| | 0 | 2.0 | | 5 | 6.0 | | 10 | 9.0 | | 15 | 8.0 | Using the data above, answer the following questions: