What is diffusion?
Diffusion is the spreading out of particles of a substance from an area of higher concentration to an area of lower concentration.
The rate of diffusion is increased by the difference in concentration, the temperature and the available surface area.
What is osmosis?
Osmosis is a special case of diffusion. It is the movement of water from a dilute to a more concentrated solution through a partially permeable membrane.
What is active transport?
Active transport moves substances from a more dilute solution to a more concentrated solution (against a concentration gradient).
Allows plants root hairs to absorb mineral ions for healthy growth from the solo.
Allow sugar molecules used for cellular respiration to be absorbed from lower concentration in the gut into the blood where the concentration is higher.