Diffusion
Leaving Cert Biology · Organisation of Life
Higher Level
The net movement of particles from a region of higher concentration to a region of lower concentration, that is down a concentration gradient. It is passive and needs no energy input from the cell.
Ordinary Level
The movement of particles from where there are many of them to where there are fewer. It does not need any energy.
Biology practice is part of Pro. Reading the definitions here is always free.
More Organisation of Life terms
Get the free study guide
H1 Owl is now on the App Store: download it for iPhone. Sign up here and get The Leaving Cert Maths Game Plan, our free PDF study guide, straight away, plus occasional study tips.
Occasional emails, no spam. Under 16? Ask a parent to sign up for you.
Where next
All Biology terms
The whole Leaving Cert Biology glossary, grouped by strand and labelled by level.
Browse BiologyQuestion of the day
One real Higher Level Maths question, new every day, with the explanation.
Answer today'sThe app
1,700+ original questions across Maths, Biology, Chemistry and Physics. Maths is free.
See the app