Chapter 24 Flashcards
1
Q
water moves by:
A
xylem or osmosis
2
Q
apoplast
A
outside plasma membrane, facilitated by hydrophilic cell wall. ends at endodermis
3
Q
symplast
A
inside cells, connected by plasmodesmata. movement is continuous (never leaves the cell)
4
Q
endodermal cells are
A
waterproofed (casparian strip blocks apoplastic water movement)
5
Q
water in xylem must cross
A
into endodermis and out of endodermis
6
Q
transpiration-cohesion-tension theory
A
theory to explain water transport in xylem
- transpiration: evaporate water from cells
- cohesion: of water due to hydrogen bonding
- tension: on xylem sap resulting from transpiration
7
Q
movement of phloem sap
A
source to sink
8
Q
source examples
A
where made or stored (leaves, storage organs)
9
Q
sink examples
A
where used or stored (roots, buds, flowers, fruits, seeds, storage organs)
10
Q
regulate stomata opening
A
- proton pump turned on by blue light
- light: fueled by photosynthesis
- decrease co2
- circadian rhythm
11
Q
regulate stomata closing
A
- dark: proton pump off
- water stress: abscisic acid turns off
