This discussion is closed.
Avi
Badges: 0
#1
Report Thread starter 16 years ago
#1
Can ne1 please explain to me the different types of water uptake mechanisms (layman's terms is fine) taken up by plants such as proton pumps, apoplast pathways , diffusion gradients etc. I can never seem to get it into my head.
0
Ellie4
Badges: 2
Rep:
?
#2
Report 16 years ago
#2
Ok well water is taken into a plant by osmosis (where water molecules move from an area of high concentration to an area of low concentration) through the roots and into the xylem. It is then carried by mass transport (due to cohesive and adhesive properities of water molecules). There are 3 different routes water can take. There is the apoplast, symplast and vacuolar. The apoplast pathway involves the water involves the water travelling along the cell walls, the symplast pathway involves water crossing over cell walls and membranes and travelling through the cytoplasm of cells, and the vacuolar involves water crossing over call walls and membranes as well as the vacuole membrane. Hope this helps a little
0
GH
Badges: 13
Rep:
?
#3
Report 16 years ago
#3
(Original post by Ellie4)
Ok well water is taken into a plant by osmosis (where water molecules move from an area of high concentration to an area of low concentration) through the roots and into the xylem. It is then carried by mass transport (due to cohesive and adhesive properities of water molecules). There are 3 different routes water can take. There is the apoplast, symplast and vacuolar. The apoplast pathway involves the water involves the water travelling along the cell walls, the symplast pathway involves water crossing over cell walls and membranes and travelling through the cytoplasm of cells, and the vacuolar involves water crossing over call walls and membranes as well as the vacuole membrane. Hope this helps a little
Excellent description here, but just to add a few details:

Apoplast pathway

Water soaks into the parenchyma cell walls and seeps along the walls towards the xylem in the centre of the root.

Symplast pathway

Water moves therough the plasma membrane into the cytoplasm of the parenchyma cell. It then moves through the tonoplast into the vacoule of the cell. It then can either move to the next cell through adjacent cell walls or moving through the plasmodesmata.
0
Avi
Badges: 0
#4
Report Thread starter 16 years ago
#4
Thanks a lot guys for your help
0
X
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Have you made your firm and insurance uni choices yet?

Yes (114)
55.34%
Yes, but I want to swap them (16)
7.77%
No, but I know who I want to choose (19)
9.22%
No, I still don't know who I want to choose (49)
23.79%
I have decided I don't want to go to uni anymore and will not be choosing (8)
3.88%

Watched Threads

View All