Summary
Summary NSC Grade 12 Life Sciences-Role of Auxins
- Course
- Life Sciences
- Institution
- 12th Grade
This document shows the role of auxins in plant response. Including tropisms, growth patterns etc
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Plants response to the environmentRole of auxins in phototropism and geotropism
Role of auxins in phototropism Role of auxins in geotropism
Produced at the tip of stem/shoot Produced at the tip of roots
Auxins move downward evenly Auxins move upwards evenly
This even distribution brings about This even distribution brings about
equal growth on all sides of the equal growth on all sides of the root
stem
As a result, the stem grows As a result, the root grows
upward downward
When the stem is exposed to When the root is placed horizontally
unilateral light (light from one side (only one side exposed to gravity)
only)
The auxin concentration will be The auxin concentration will be high
high on the dark side – light on the lower side of the root - gravity
destroys auxins attracts auxins
More growth occurs on the dark More growth occurs on the upper
side because auxins stimulate side of the root because auxins on
growth on the dark side the lower side inhibit growth
As a result, the stem bends As a result, the root bends
towards the light downwards
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