A Level Biology Revision Lesson 66: Osmosis (1) An Overview.

Task 1. Check Where this Lesson fits into your Exam Specification!

Task 2. Watch the Revision Lesson in Full.

Download the accompanying revision notes (A3 PDF)


Check Your Spec!

★ AQA Specification Reference: - 3.2.3 Transport across cell membranes. Movement across membranes occurs by: Students should be able to explain osmosis (explained in terms of water potential). Explain how surface area, number of channel or carrier proteins and differences in gradients of concentration or water potential affect the rate of movement across cell membranes.


★ CIE Specification Reference: - 4 Cell membranes and transport. 4.2 Movement of substances into and out of cells: a) describe and explain the processes of Osmosis. Explain the movement of water between cells and solutions with different water potentials and explain the different effects on plant and animal cells.


★ Edexcel (Biology A – Salters-Nuffield) Specification Reference: - Topic 2: Genes and Health:  2.3 Understand what is meant by osmosis in terms of the movement of free water molecules through a partially permeable membrane (consideration of water potential is not required).

★ Edexcel (Biology B) Specification Reference: - Topic 4: Exchange and Transport. 4.2 Cell transport mechanisms: Understand how passive transport is brought about by osmosis: CORE PRACTICAL 6: Determine the water potential of plant cells.


★ OCR (Biology A) Specification Reference: - Module 2: Foundations in biology: 2.1.5 Biological membranes. (e)  the movement of water across membranes by osmosis and the effects that solutions of different water potential can have on plant and animal cells. Practical investigations into the effects of solutions of different water potential on plant and animal cells. Osmosis to be explained in terms of a water potential gradient across a partially permeable membrane.


★ OCR (Biology B) Specification Reference: - Module 2: Cells, chemicals for life, transport and gas exchange. 


★ WJEC Specification Reference: -Core Concepts: 3. Cell membranes and transport. Overview: Cell membranes are essential in the control of the movement of substances into and out of the cell. 

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