Diffusion is the movement of a substance from a region of high concentration to an area of low concentration. This is also known as substances moving down a concentration gradient.
It is a passive form of transport which does not require energy.
This is important so that plants get the raw material they need for photosynthesis;
In – carbon dioxide and water.
Out – Oxygen and Glucose
This is important so that animals get the raw materials they need for respiration;
In – Oxygen and Glucose.
Out – Carbon Dioxide and Water.
If the concentration of glucose inside and outside the cell is the same, diffusion will not take place.
I have attached here the powerpoint of the notes we have taken so far. If you have been off, use this to help you catch up.