Plant Responses - Growth Hormones Flashcards
1
Q
What is plant responses?
A
- plants respond to changes in their environment in their environment to manage their chances of survival, e.g. towards the light to increase rate of photosynthesis
2
Q
what is tropism?
A
- the response to a plant to a directional stimulus
3
Q
what are growth hormones?
A
- Plants response to stimuli using growth hormones
- as they have a circulatory system or a nervous systems like humans
4
Q
What are auxins (IAA)?
A
- they cause cell elongation in shoots (not cell division)
5
Q
what are gibbrellins?
A
- they responsible for controlling flowering and germination
6
Q
what are common about all growth hormones?
A
- they are made in the growing regions of the plants - root tips and shoot tips
7
Q
how do growth hormones move short distances?
A
- move short diffusion by diffusion and active transport
8
Q
where do growth hormones move long distances?
A
- in the phloem
9
Q
what happens in phototropism?
A
- IAA moves to the shaded side of the shoot/root
10
Q
what happens in geotropism?
A
- IAA always move to the underside
11
Q
In shoots, what happens in phototropism?
A
- IAA causes cell elongation, shoots grow towards the light
12
Q
In roots, what happens in phototropism?
A
- IAA inhibits cell growth -> roots grow towards the light
13
Q
In shoots, what happens in geotropism?
A
- grow way from gravity,
- cell elongation
- negative geotropism
14
Q
In roots, what happens in geotropism?
A
- grow towards gravity
- Positive geotropism
