A student used a respirometer containing potassium hydroxide (KOH\text{KOH}KOH) solution to measure the rate of aerobic respiration in germinating mung beans.
During an experiment lasting 24 hours24\text{ hours}24 hours, a sample of 25 g25\text{ g}25 g of mung beans absorbed 4.8×10−3 cm34.8 \times 10^{-3}\text{ cm}^34.8×10−3 cm3 of oxygen.
Apart from time, identify two measurements the student would need to make to determine the volume of oxygen absorbed by the mung beans in cm3\text{cm}^3cm3.
Calculate the rate of oxygen uptake by these mung beans in cm3 g−1 hour−1\text{cm}^3\text{ g}^{-1}\text{ hour}^{-1}cm3 g−1 hour−1. Give your answer in standard form (scientific notation).
7 exam-style questions on AQA A Level Biology Respiration (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.