Transport in Stupid Plants

Question 2

Water potential differences _______ water movement

Answer 2

govern the direciton

Question 3

What is water potential

Answer 3

tendency of a solution to take up water from pure water across a membrane

Question 4

Equation for water potential?

Answer 4

psi = psi (solute) + psi (pressure)

Question 5

solute potential is also called

Answer 5

osmotic potential

Question 6

what is solute potential?

Answer 6

measures the effect of dissolved solutes on the osmotic behavior of the solution

Question 7

H2O will move wherever the water potential is

Answer 7

less

Question 8

What is turgor pressure?

Answer 8

The pressure that stops water from coming into the cell as it gets fuller

Question 9

When the solute and pressure potentials are equal, the cell is

Answer 9

turgid

Question 10

bulk flow is

Answer 10

flow of higher pressure to lower pressure

Question 11

Instead of sodium/potassium pumps plants have

Answer 11

proton pumps

Question 12

How does a proton pump work?

Answer 12

it uses ATP to move protons out of the cell

Question 13

Describe the apoplast

Answer 13

consists of cell walls and space between them (intercellular space)

Question 14

Water/substances flow through the apoplast

Answer 14

fast and unregulated

Question 15

The symplast passes through

Answer 15

the continuous cytoplasm connected by plastmodesmata

Question 16

Movement through the symlast is _____ regulated

Answer 16

tightly

Question 17

The endodermis (the innermost layer of the root cortex) is distinguished from the rest of the ground tissue by the

Answer 17

Casparian strip

Question 18

The Casparaian strip is

Answer 18

a waxy protective layer touching all endodermis cells

Question 19

T/F: The xylem sap is pumped by living cells

Answer 19

FALSE

Question 20

Root pressure is

Answer 20

pressure that would force liquid up the xylem

Question 21

T/F: Root pressure does not account for xylem transport

Answer 21

True

Question 22

The 3 parts of xylem transport

Answer 22

transpirationcohesiontension

Question 23

Tension happens when

Answer 23

water evaporates, pulling water up

Question 24

Transpiration happens when

Answer 24

water vapor leaves from the stomata (concentration of water vapor is less than in the leaf) - causing tension

Question 25

Cohesion happens when

Answer 25

water moves up together due to hydrogen boding forces (sick)

Question 26

T/F: Transpiration-tension-cohesion requires energy

Answer 26

FALSE

Question 27

what does a pressure chamber measure?

Answer 27

tension in xylem sap

Question 28

Stomata are

Answer 28

the pores that take in CO2 and expel water vapor

Question 29

Specialized epidermal cells that control opening and closing of stoma

Answer 29

guard cells

Question 30

Movement through the phloem is called

Answer 30

translocation

Question 31

A source is

Answer 31

an organ that produces more sugars than it requires

Question 32

A sink is

Answer 32

an organ that consumes sugars

Question 33

Cells of the phloem are called

Answer 33

seive tube elements

Question 34

End walls of plasmodesmata with huge diameters create

Answer 34

seive plates

Question 35

Cells that conatin seive element organells to direct seive tube elements are called

Answer 35

companion cells