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National 4/5 – Diffusion

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.

Transport Across Membranes


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