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Learn: Diffusion, Osmosis, and Active Transport
OCR GCSE Combined Science J250
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Welcome!Today we'll learn about diffusion, osmosis, and active transport. These processes are vital for the movement of substances in and out of cells.
What is Diffusion?Diffusion is the movement of particles from an area of high concentration to an area of low concentration. This process happens until the particles are evenly spread out. It does not require energy and occurs in gases and liquids.
Quick check: Which of the following describes diffusion?
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What is Osmosis?Osmosis is the movement of water molecules across a partially permeable membrane, from an area of high water concentration to an area of low water concentration. It is a type of diffusion specific to water and does not require energy.
Osmosis is the movement of {{blank0}} molecules through a {{blank1}} membrane.
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What is Active Transport?Active transport is the movement of particles from an area of low concentration to an area of high concentration, against the concentration gradient. This process requires energy, which comes from respiration.
Quick check: What is required for active transport to occur?
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Review Time!Great work! You've learned about diffusion, osmosis, and active transport. Now let's test your understanding with a few questions.
Which of the following statements are true? (Select all that apply)
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Match the items on the left with their correct pairs on the right
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Match the items on the left with their correct pairs on the right
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