Question 18
HA plant controls the amount of water it loses through its leaves. The figure shows the control system that the plant uses.
Figure: The control system that a plant uses to control the amount of water lost from its leaves
a.[2]
Name the type of part in a control system that P and Q each represent.
b.[1]
The response shown in the figure is a chemical response. Suggest one way this response differs from a nervous response in an animal.
c.[2]
The water content of the leaf is not held at a fixed value. Explain why the figure still shows homeostasis.
5.1 Homeostasis Questions
40 exam-style questions on AQA GCSE Biology 5.1 Homeostasis, covering 5.1 Homeostasis. Each one has a worked solution and a mark scheme showing where the marks go.