Plant responses Flashcards
1
Q
What is Tropism?
A
The growth of a plant towards a directional stimulus e.g. light
2
Q
What is Phototropism?
A
Plant growth towards light (positive phototropism)
3
Q
How do plants grow?
A
The tip of the shoot produces Auxin
Auxin diffuses down the shoot to cause elongation of cells.
When light intensity is higher on 1 side of the stem, auxin builds up on the shaded side
Therefore cells on shaded side elongate
Shoot bends towards light
4
Q
What is Geotropism?
A
The growth towards or away from gravity e.g. roots are positive geotrophic
