B.2 movement in and out of cells

Question 1

define the Brownian motion/ diffusion

Answer 1

the net movement of particles from their higher concentration to a region of lower concentration down a concentration gradient as a result of their random movement

Question 2

define osmosis

Answer 2

the net movement of water from their higher water potential to a region of lower water potential, through a partially permeable membrane

Question 3

state how animal cells behave in a hypertonic solution

Answer 3

since animal cells have a higher water potential than the solution
the movement of water is out of cells
cells become crenated and shrivel up

Question 4

state how animal cells behave in a hypotonic solution

Answer 4

since red blood cells have a lower water potential than the solution
water moves in the cell until the cell bursts and becomes flaccid
because animals cells have no cell wall therefore no turgor pressure to hold it together

Question 5

state why osmosis is important for plants

Answer 5

for nutrition: the uptake of water + mineral ions

Question 6

state why osmosis is important for animals

Answer 6

for excretion : animal cells and tissue