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Auxin is a plant hormone involved in regulating shoot growth by promoting cell elongation. It is produced in the shoot tip and moves through the plant, distributing unevenly in response to environmental factors such as light and gravity.
Diagram Description
Auxin Distribution in a Plant Shoot
The diagram shows a plant shoot bending towards a light source. Auxin concentration is higher on the shaded side of the shoot than on the side facing the light.
| Side of Shoot | Auxin Concentration |
|---|---|
| Light side | Low |
| Shaded side | High |
- a[1]
State where auxin is produced in the plant shoot.
Aim for approximately 1 distinct marking point.
- b[3]
Explain how uneven auxin distribution causes the shoot to bend towards the light.
Aim for approximately 3 distinct marking points.
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