Transport

Question 1

what is diffusion

Answer 1

net movement of particles from an area of high concentration to low concentration - becoming equally dispersed

Question 2

how is diffusion good

Answer 2

it is a passive process, not requiring energy because it moves down concentration gradient

Question 3

what affects diffusion

Answer 3

temperature - heat energy is transferred to kinetic energy which means particles move faster from high to low
surface area - increase in surface area means more space for diffusion of particles
a steep concentration gradient - big difference of particles mean that rate movement is faster

Question 4

what happens to surface area as size increases

Answer 4

the ratio of surface area to volume decreases

Question 5

what is osmosis

Answer 5

the movement of water molecules from a dilute solution to a more concentrated solution through a selectively permeable membrane

Question 6

what happens to plant cells in a hypertonic solution

Answer 6

water moves out which results in volume of vacuole decreasing and the cell membrane being pulled from the cell wall - PLASMOLYSIS
wilting of plant

Question 7

what happens when a plant is in hypotonic solution

Answer 7

water moves in therefore increasing volume of vacuole and plant becomes turgid stand up right

Question 8

what is active transport

Answer 8

a substance needs to be moved from an area of low concentration to high concentration
requires energy from cell