Phototropism Flashcards
1
Q
What are phototropisms the result of ?
A
- result of the movement of auxins across the shoot or root if it is exposed to light that is stronger on one side than the other
2
Q
What happens if plants are grown in all round light in normal conditions of gravity?
A
- grow straight up
- grow faster in low than bright light
3
Q
What happens if the plant is exposed to light on one side?
A
- shoots grow towards light
- roots, if exposed, grow away
- negatively phototrophic
4
Q
Why does this occur when light is one one side?
A
- max light
- max photosyntehsis
- roots return to soil
5
Q
What happens if the tip is removed?
A
- no response
- no auxin produced
6
Q
What happens if the tip is covered?
A
- no response
- light stimulus must be detected at tip
7
Q
What happens if mica is added to shoot (impermeable barrier)
A
- light side
- auxin moved down shaded side
- bends toweards light
- shaded side
- movement down shaded side is prevented
- no ressponse
