a.[1]
What name is given to a plant's growth response to gravity? Select one option:
- Geotropism
- Photosynthesis
- Transpiration
b.[1]
Which plant hormone controls growth responses like geotropism? Select one option:
- Auxin
- Insulin
- Thyroxine
c.[2]
A plant root grows downwards in response to gravity. Which two substances can the root absorb in larger amounts when it grows deeper into the soil? Select two options:
- Carbon dioxide
- Glucose
- Phosphate ions
- Starch
- Water
d.[6]
Plan an investigation to show the effect of gravity on the direction of growth of germinating seed roots (radicles).
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.
