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Investigating Phototropism in Shoots
Method
Method to Investigate Phototropism
1. Place several young bean seedlings in a box with a small hole on one side to allow light in. 2. Keep the box in a warm place and water the seedlings regularly. 3. After 5 days, observe and measure the angle of bending of the shoots towards the light. 4. Repeat the experiment with the hole on different sides to change light direction.
| Seedling | Angle of Bending (degrees) |
|---|---|
| 1 | 30 |
| 2 | 28 |
| 3 | 32 |
| 4 | 29 |
| 5 | 31 |
- a[1]
Describe Describe how the shoots respond to the light in this investigation.
Aim for approximately 1 distinct marking point.
- b[1]
Identify Identify the independent variable in this investigation.
Aim for approximately 1 distinct marking point.
- c[1]
Suggest Suggest one control variable that should be kept constant in this investigation.
Aim for approximately 1 distinct marking point.
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