Topic 4: Regulation of systems

Question 1

What is the Xylem?

Answer 1

the part of vascular tissue that transports water and minerals throughout a plant and provides plant with support

Question 2

Explain Turgor pressure?

Answer 2

force or pressure potential within a fully hydrated plant cell that pushes the plasma membrane against cell wall

Question 3

Define Root Hairs?

Answer 3

Extension of cells that form outer covering of the root, responsible for absorption and uptake of liquid water.

Question 4

What is Suberin?

Answer 4

a non-cellular waxy substance that forms a waterproof barrier on cell walls of some plant cells.

Question 5

What is the Casparian strip?

Answer 5

a ring of
waterproof material, composed
of lignin, deposited on the walls of
endodermal cells that forces all soil
water to move into the cells of the
endoderm before it can reach the
xylem

Question 6

Define aquaporins

Answer 6

protein channels in the
plasma membrane that allow the
rapid flow of water into and out of
cells