Movement In And Out Of Cells

Question 1

Diffusion

Answer 1

The net movement of molecules or ions from a region of higher concentration to lower concentration down a concentration gradient

Question 2

Factors that affect the rate of diffusion

Answer 2

Size of molecule

Distance (less=quicker)

Surface area (more=quicker)

Temperature (higher=quicker)

Concentration gradient (increases=quicker)

Question 3

Osmosis

Answer 3

The diffusion of water molecules from a dilute solution into a more concentrated solution through a partially permeable membrane down a water potential

Question 4

If a cells is turgid:

Answer 4

Inflated with water

When the cells take up water by osmosis they swell but the cell wall prevents them from bursting. Become turgid when put in a dilute solution

Question 5

Plasmolysed

Answer 5

Has lost water causing the cell membrane to be pulled away from the cell wall

Question 6

Flaccid

Answer 6

A plant cell that is limp through a reduction of pressure inside the cell

Question 7

Active transport

Answer 7

The movement of ions or molecules across a cell membrane from a lower to a higher concentration