Osmosis

Diffusion, Osmosis and Active Transport

Biology GCSE Paper 1 - Topic 1 (Cell Biology)

What is Diffusion?

Diffusion is...

...the spreading out of particles from an area of higher concentration to an area of lower concentration.

Examples of Diffusion

In the cell membrane oxygen, glucose, water and amino acids can diffuse through but bigger molecules such as starch and proteins cannot.

What is Osmosis?

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.

What is Active Transport?

Active Transport is...

...when substances are absorbed against the concentration gradient from an area of lower concentration to an area of higher concentration.

Quick Quiz

Multiple Choice

Osmosis is the movement of water across a ____ membrane?

• Cell Membrane

• Cell Wall

• Partially Permeable

• Partially Solid

Labelling

When a root hair cell takes in water and minerals, what process does it use?

Drag labels to their correct position on the image

Diffusion

Osmosis

Active Transport

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