CB1h

Question 1

how does diffusion occur give an example

Answer 1

fewer particles in higher concentration areas moving into lower concentration areas. e.g how smells spread

Question 2

what is osmosis

Answer 2

osmosis is the diffusion of water molecules, from a region where they are in higher concentration, to a region where they are in lower concentration.

Question 3

What is active transport

Answer 3

when cells transport molecules that are too big to diffuse through the cell membrane
Low to high concentration. active transport requires energy

Question 4

what are two differences between osmosis and diffusion to active transport

Answer 4

diffusion and osmosis travel from high to low
active transport travels from low to high

diffusion and osmosis don’t need energy whereas active transport needs energy as active transport goes against the gradient

Question 5

describe the cell membrane/ what can go through it and why

Answer 5

the cell membrane is partially permeable, they trap large soluble molecules inside cells, but water molecules can diffuse through the membrane

if there is more water molecules on one side of the membrane they will be a movement of water, to make it equal

Question 6

what process is osmosis and diffusion

Answer 6

passive processes