GCSE Biology: Osmosis

5th April 2017

GCSE Biology Revision New Syllabus

GCSE Osmosis revision - key facts!


Osmosis is a process of diffusion and can involve the movement of gas or water from an area of high concentration to an area of lower concentration.

This means that cells have to have semi-permeable membranes in order to allow for this movement.

Multicellular organisms are specialised for this process of exchange through a variety of adaptations including cells:

  • Having a large surface area

  • Having a membrane that is thin in order to make the diffusion path as short as possible

  • Having an efficient blood supply


Osmosis takes place in all living cells including plant cells which allows plants to absorb water from the soil. Osmosis is also facilitated by stomata in plant cells which allows gases to pass in and out of the plant to enable to the process of photosynthesis to take place. For more on how osmosis is a key part of the photosynthesis process, take a look at our songs Photosynthesis part 1 and photosynthesis part 2 which go into more detail on the key facts you need to know when revising for you GCSE Biology exams.


Don’t forget to check out our song specifically on osmosis to help you understand the finer details of the process.



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