Diffusion, osmosis and active transport.

Question 1

Define diffusion.

Answer 1

Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration.

Question 2

Define Osmosis.

Answer 2

Osmosis is the movement of water molecules across a partially permeable membrane from a region of higher water concentration to a region of lower water concentration.

Question 3

What is active transport?

Answer 3

Active transport is the movement of particles across a membrane against a concentration gradient (i.e. from an area of lower concentration to an area of higher concentration) using energy transferred during respiration.