Controlling Plant Growth Flashcards
1
Q
What is phototropism?
A
A plant’s growth response to light.
2
Q
What is geotropism?
A
A plant’s growth response to gravity.
3
Q
How would you describe a shoot in terms of photo/geotropism?
A
It is positively phototropic and negatively geotropic (opposite for roots)
4
Q
What is the name of the plant hormone for growth?
A
Auxins
5
Q
How do auxins move?
A
In solution
6
Q
Where are auxins made?
A
Root and shoot tips
7
Q
Where are auxins found in the shoot?
A
On the shaded side.
8
Q
How do auxins cause the curvature of a shoot?
A
More auxins on one side on the shoot cause more cell elongation, making the cells on this side of the shoot to be longer, making the shoot bend towards the light.
9
Q
What are the commercial uses of plant hormones?
A
- selective weedkillers (kill specific weeds to increase crop yield)
- rooting powder (increase root growth of cuttings)
- delay or accelerate fruit ripening (meet market demands)
- control dormancy in seeds
