a.[1]
What name is given to a plant's growth response to directional light? Select one option:
- Geotropism
- Phototropism
- Translocation
b.[1]
Which plant hormone coordinates growth responses like phototropism by accumulating on the shaded side of the shoot? Select one option:
- Auxin
- Adrenaline
- Glucagon
c.[2]
A plant shoot bends and grows towards a light source. Which two substances or resources can the leaves of this shoot capture or absorb in larger amounts as a result of this response? Select two options:
- Carbon dioxide
- Mineral ions
- Sunlight
- Water
- Oxygen
d.[5]
Plan an investigation to show the effect of unilateral (one-sided) light on the direction of growth of germinating seed shoots (plumules).
You should include:
- a control group or experimental setup comparison
- the measurements or observations you would record
- how you would control variables to ensure a valid investigation.
You may use the equipment shown in Figure 1 and any other standard laboratory apparatus.
Figure 1
