Diffusion - Organisation P1

Question 1

What is diffusion?

Answer 1

The net movement of particles from an area of higher concentration to an area of lower concentration.

Question 2

What does diffusion happen in?

Answer 2

Solutions and gases

Question 3

What factors affect the rate of diffusion?

Explain

Answer 3

• Temperature - particles will have more kinetic energy thus will move around faster
• Concentration gradient - the bigger the difference, the faster rate of diffusion
• Surface area of membrane - larger the surface area, the faster the rate of diffusion - more particles will move throught the membrane at the same time

Question 4

What is the surface area to volume ratio like in single celled organisms?

Answer 4

Large surface area to volume ratios

Question 5

What is the surface area to volume ratio like in multi-cellular organisms?

Answer 5

small surface area to volume ratios