Plant Hormones Flashcards
1
Q
define stimuli
A
changes in the environment
2
Q
tropism
A
directed growth response
3
Q
what are the different plant stimuli?
A
- light
- gravity
- temperature
- water
- physical touch
4
Q
+ve/-ve phototropism
A
towards/away light
5
Q
+ve/-ve geotropism
A
towards/away gravity
6
Q
+ve/-ve hydrotropism
A
towards/away water
7
Q
+ve/-ve thigmotropism
A
towards/away touch
8
Q
Gibberellins
A
Hormone used to increase fruit size, end seed dormancy and promote flowering
9
Q
Describe +ve geotropism in roots terms auxin
A
- root lays sideways; more auxin on lower surface due to gravity (UNEQUAL DISTRIBUTION
- auxin inhibits cell elongation in roots
- upper surface grows quicker; grows down towards gravity
10
Q
Describe -ve geotropism in shoots terms auxin
A
- shoot lays sideways; more auxin on lower surface due to gravity (UNEQUAL DISTRIBUTION
- auxin promotes cell elongation in roots
- lower surface grows quicker; grows up away from gravity
11
Q
Ethene
A
Hormone used to control fruit ripening
