A student used a potometer to investigate the effect of temperature on the rate of water uptake by a leafy shoot. The results are shown in the table.
Table: The mean distance moved by the air bubble in a potometer in 10 minutes at four different air temperatures
| Air temperature in °C | Mean distance moved by the air bubble in 10 minutes in mm |
|---|---|
| 10 | 12 |
| 20 | 26 |
| 30 | 45 |
| 40 | 68 |
Calculate the mean rate at which the air bubble moved at 30 °C. Give your answer in mm per minute.
Describe and explain the effect of air temperature on the rate of water uptake by the shoot.
The student concluded that temperature is the only factor that affects the rate of transpiration. Give one reason why this conclusion is not valid.
38 exam-style questions on AQA GCSE Biology 2.3 Plant tissues, organs and systems, covering 2.3.1 Plant tissues and 2.3.2 Plant organ system. Each one has a worked solution and a mark scheme showing where the marks go.