8. Plant signalling Flashcards
1
Q
How long ago did plants move to dry land|?
A
Over 450 million years ago.
2
Q
What is Thigmonasty?
A
A plants response to touch.
3
Q
What is a plasmodesmata?
A
a channel which enables transport and communication between plant cells.
4
Q
Name 2 components of the plants anatomy which help aid the vascular system
A
Xylem - water moves from soil to atmosphere via xylem dead cells
Phloem - sugars produced by photosynthesis are transported via the phloem
5
Q
Describe how Thigmonasty occurs
A
- Ions flow into outer cells in Pulvini
- Uptake of Aquaporins and H+ ATPase pumps
- Turgor increase/decrease due to osmosis
6
Q
How does the xylem respond to drought?
A
- Drought-stressed roots release signals
- signals cause guard cells to close
- reduced respiration
- water is preserved
7
Q
What feature of the plant controls cell size
A
Vacuole during osmosis
8
Q
What molecule provides signals for the uptake of phosphate and how does this occur?
A
microRNA (miR399) by moving through the phloem
