Phototropism is a growth response by part of a plant to unilateral light.
a.[2]
Name one other tropism. Give the stimulus the plant responds to in the tropism you have named.
b.[6]
Plan an investigation to show the effect of unilateral light on the growth of plant shoots.
Include details of any controls needed.
You may use some of the equipment shown in Figure 1 and any other laboratory apparatus.
c.[3]
Explain how phototropism in a plant shoot helps the plant to survive.