Transport in Stupid Plants Flashcards Preview

College Biology & Ecology > Transport in Stupid Plants > Flashcards

Flashcards in Transport in Stupid Plants Deck (34)
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2
Q

Water potential differences _______ water movement

A

govern the direciton

3
Q

What is water potential

A

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

4
Q

Equation for water potential?

A

psi = psi (solute) + psi (pressure)

5
Q

solute potential is also called

A

osmotic potential

6
Q

what is solute potential?

A

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

7
Q

H2O will move wherever the water potential is

A

less

8
Q

What is turgor pressure?

A

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

9
Q

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

A

turgid

10
Q

bulk flow is

A

flow of higher pressure to lower pressure

11
Q

Instead of sodium/potassium pumps plants have

A

proton pumps

12
Q

How does a proton pump work?

A

it uses ATP to move protons out of the cell

13
Q

Describe the apoplast

A

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

14
Q

Water/substances flow through the apoplast

A

fast and unregulated

15
Q

The symplast passes through

A

the continuous cytoplasm connected by plastmodesmata

16
Q

Movement through the symlast is _____ regulated

A

tightly

17
Q

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

A

Casparian strip

18
Q

The Casparaian strip is

A

a waxy protective layer touching all endodermis cells

19
Q

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

A

FALSE

20
Q

Root pressure is

A

pressure that would force liquid up the xylem

21
Q

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

A

True

22
Q

The 3 parts of xylem transport

A

transpirationcohesiontension

23
Q

Tension happens when

A

water evaporates, pulling water up

24
Q

Transpiration happens when

A

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

25
Q

Cohesion happens when

A

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

26
Q

T/F: Transpiration-tension-cohesion requires energy

A

FALSE

27
Q

what does a pressure chamber measure?

A

tension in xylem sap

28
Q

Stomata are

A

the pores that take in CO2 and expel water vapor

29
Q

Specialized epidermal cells that control opening and closing of stoma

A

guard cells

30
Q

Movement through the phloem is called

A

translocation

31
Q

A source is

A

an organ that produces more sugars than it requires

32
Q

A sink is

A

an organ that consumes sugars

33
Q

Cells of the phloem are called

A

seive tube elements

34
Q

End walls of plasmodesmata with huge diameters create

A

seive plates

35
Q

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

A

companion cells