Diffusion, Osmosis and Active Transport

Question 1

Define diffusion

Answer 1

Movement of substances from a high concentration to a low concentration

Question 2

What 4 things can affect the rate of diffusion?

Answer 2

Concentration gradient
Surface area
Distance
Temperature

Question 3

Define osmosis

Answer 3

Movement of water from a high water potential (low concentration) to a low water potential (high concentration) through a partially permeable membrane

Question 4

Define dilute solution

Answer 4

Have a high concentration of water particles

Question 5

Define concentrate solution

Answer 5

Have low concentration of water particles

Question 6

What happens if cells are placed in distilled water?

Answer 6

They swell up and burst

Question 7

What happens if cells are placed in a concentrated salt solution?

Answer 7

They shrink and shrivel

Question 8

Define active transport

Answer 8

Movement of substances from a low concentration to a high concentration. it needs energy to move against the concentration gradient.

Question 9

Name 2 ways that active transport differs from diffusion

Answer 9

Uses energy

Against concentration gradient

Question 10

Where does the energy needed for active transport come from?

Answer 10

Respiration in cells (mitochondria)