13 - Transport in Plants

Question 1

What is passive transport?

Answer 1

moves mol.s short distances/across membranes
wX added energy

Question 2

What are the types of passive transport?

Answer 2

1. Simple Diffusion
2. Facilitated Diffusion
3. Osmosis

Question 3

What’s diffusion?

Answer 3

net movement of a molecule population down its
concentration gradient wX energy

Question 4

Simple diffusion

Answer 4

molecules crossing the phospholipid bilayer on the concentration gradient [high -> low] wX energy

Question 5

Facilitated diffusion

Answer 5

crossing of a membrane through a transport protein

Question 6

Osmosis

Answer 6

H2O net diffusion from [high -> low water] concentration of water (against solute concentration gradient) until equilibrium

Question 7

What processes are short distance transport & what are long distance transports?

Answer 7

Short - diffusion (can easily cross one cell layer)
Long - crossing various layers of cells or crossing distances (like roads, trees, etc)

Question 8

Across a membrane, molecules move via:

Answer 8

• Simple Diffusion
• Facilitated Diffusion

Question 9

Molecule: Simple diffusion

Answer 9

Small & non-polar

Question 10

Molecules: Facilitated

Answer 10

Large & charged/polar molecules

Question 11

Tonicity

Answer 11

ability of a surrounding solution to cause a cell to gain or lose water
(solute molecules are non-penetrating -> ,’, water is the only thing that can move
across the membrane)

Question 12

Concentration gradient

Answer 12

process by which mols move down high to low

Question 13

Diffusion Factor: Concentration gradient

Answer 13

greater difference in concentration will increase diffusion rate

Question 14

Diffusion Factor: (B1 - TEMPERATURE)

Answer 14

Higher temp -> ↑ mol dancing & ↑ diff. rate

Question 15

Diffusion Factor: molecular mass

Answer 15

Bigger mols < smaller mols in speed

Question 16

Diffusion Factor: solubility

Answer 16

polar/non-lipid solb. mols < speed OR need assistance to cross membrane

Question 17

Diffusion Factor: Membrane thickness

Answer 17

harder & longer to pass through thicker membrane

Question 18

Diffusion Factor: Membrane surface area

Answer 18

m space for mols to pass through -> more mols pass thru per sec -> faster rate of diff

Question 19

Diffusion Factor: distance travelled

Answer 19

limit to how far mols can efficiently travel to exit/enter a cell