Diffusion, osmosis and active transport

Question 1

What is diffusion?

Answer 1

the net movement of particles from an area of higher concentration to an area of lower concentration until it is evenly spread out

Question 2

What are the factors affecting diffusion?

Answer 2

Concentration gradient - the difference in concentrations
Temperature
Surface area of membrane

Question 3

What does a large surface area of an organism allow?

Answer 3

allows enough molecules to diffuse into and out of the cells

Question 4

What is osmosis?

Answer 4

the diffusion of water from a dilute solution to a concentrated solution through a partially permeable membrane

Question 5

What is active transport?

Answer 5

movement of substances against the concentration gradient from an area of lower concentration to an area or higher concentration

Question 6

Example of active transport

Answer 6

Plant roots take in minerals from the soil against the concentration gradient

Question 7

Does diffusion need energy?

Answer 7

no it is a passive process (doesn’t need energy)

Question 8

Does osmosis need energy?

Answer 8

no it’s a passive process (doesn’t need energy)

Question 9

Does active transport need energy?

Answer 9

yes it needs energy as it’s going against the concentration gradient

Question 10

What is the concentration gradient?

Answer 10

a change in the concentration of a substance from one region to another

Question 11

When does a concentration gradient exist?

Answer 11

when there is a region of high concentration leading to a region of low concentration

Question 12

What does going from high to low concentration do?

Answer 12

going down the concentration gradient

Question 13

What does going from low to high concentration do?

Answer 13

going against the concentration gradient