revision for movement of particles test

Question 1

definition of diffusion

Answer 1

the net movement of particles from an area of high concentration to low concentration. this moves down the concentration gradient

Question 2

definition of osmosis

Answer 2

the net movement of water particles from an area of high water potential to low water potential through a partially permeable membrane. moves down the concentration gradient

Question 3

definition of active transport

Answer 3

a process which requires energy from respiration to move particles from an area of low to high concentration, usually through a protein pump. against the concentration gradient

Question 4

examples of diffusion

Answer 4

food dye in water
tea in water
coffee in water
air freshener in a room

Question 5

examples of osmosis

Answer 5

red blood cells in water
potatoes in sucrose solution

Question 6

example of active transport

Answer 6

glucose in the intestines

Question 7

how does temperature affect rate of movement

Answer 7

when the temperature is high, movement is faster, e.g. putting a teabag in boiling water, rather than cold

Question 8

affect of surface area to volume ratio

Answer 8

larger the surface area to volume ratio, the faster movement takes