Name the plant growth regulator responsible for starting seed germination.
State the function of potassium hydroxide solution when a respirometer is used.
As respiration occurs, oxygen is consumed by the seeds and the coloured liquid drops down the tube. Describe the role of oxygen in aerobic respiration.
Suggest why the respirometers were left for $10$ minutes before any readings were taken.
Suggest why respirometers B and D were included in this investigation.
Calculate the oxygen uptake rate in $\text{cm}^3$ per minute for respirometer C from 5 to 20 minutes. Your answer should be to two significant figures. Show your working.
Explain why germinating pea seeds respire faster between $10\,^{\circ}\text{C}$ and $25\,^{\circ}\text{C}$.
Suggest why carrying out the experiment with germinating seeds at $50\,^{\circ}\text{C}$ might give a lower respiration rate than at $25\,^{\circ}\text{C}$.