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Learn: Diffusion and Osmosis
WJEC GCSE in BIOLOGY specification
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Welcome!Today we'll explore diffusion and osmosis, key processes for moving substances in and out of cells. Let's break it down step by step!
What is Diffusion?Diffusion is the movement of particles from an area of high concentration to an area of low concentration down a concentration gradient. It is a passive process, meaning it does not require energy.
Examples of DiffusionDiffusion occurs in many biological processes. For example, oxygen diffuses into cells for respiration, while carbon dioxide diffuses out as waste. These movements occur through the cell membrane.
Quick check: Diffusion requires energy. True or false?
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What is Osmosis?Osmosis is the movement of water molecules through a selectively permeable membrane from an area of high water potential to an area of low water potential. Like diffusion, it is a passive process.
Osmosis involves the movement of {{blank0}} molecules through a {{blank1}} membrane.
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What is Active Transport?Active transport moves substances against a concentration gradient, from low to high concentration. It requires energy in the form of ATP and is used to absorb nutrients like minerals in plant roots.
Match the items on the left with their correct pairs on the right
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Investigating DiffusionA model of diffusion can be demonstrated using Visking tubing. This tubing acts as a selectively permeable membrane, allowing small particles to pass while blocking larger ones.
Select all correct statements about diffusion:
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Review Time!Great work! You've learned about diffusion, osmosis, and active transport. Let's test your understanding with a few questions.
Quick check: What type of transport requires energy?
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Diffusion is the movement of particles down a {{blank0}} gradient.
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Which of the following processes are passive? (Select all that apply)
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