Plant hormones (P2C5) Flashcards
1
Q
What is gravitropism?
A
Gravitropism is the growth of a plant as a result of gravity.
2
Q
What is phototropism?
A
Phototropism is the growth of a plant as a result of light levels.
3
Q
How does auxin affect the growth of roots?
A
In roots, auxin causes less elongation in the lower section. This makes the roots grow downwards.
4
Q
How does auxin affect the growth of shoots?
A
In shoots, auxin causes more elongation in the shaded section. This makes the shoots grow toward the sun.
5
Q
How is auxin used by farmers? (3 points)
A
- Auxin kills weeds by making the weeds grow so rapidly they use up all food reserves.
- Auxin can be used in rooting powders by making cuttings produce roots.
- Auxin can be used to promote growth in tissue culture.
6
Q
How are gibberellins used by farmers? (3 points)
A
- Giberellins make seeds germinate.
- Giberellins promote flowering.
- Giberellins increase fruit size.
7
Q
What is germination?
A
Germination is the process of a plant growing from a seed.
