Osmosis and Active Transport — Interactive Lesson (Ages 14–16)

Why does salted fish keep, and how do roots take in minerals from the soil? This 21-slide interactive lesson on osmosis takes pupils from first ideas to exam-style explanations, with 13 self-marking activities and nothing to prepare beforehand.

Teaching Osmosis and Active Transport in GCSE Biology

Pupils define osmosis as the diffusion of water across a partially permeable membrane and predict what happens to animal and plant cells in pure water and concentrated solutions, including turgid, flaccid and plasmolysed cells. They calculate percentage change in mass from the potato cylinder required practical, explain active transport in root hair cells and the gut, and compare diffusion, osmosis and active transport.

What Pupils Will Learn

• Define osmosis.
• Predict what happens to animal and plant cells in different solutions.
• Calculate percentage change in mass from an osmosis experiment.
• Define active transport and explain why it needs energy.
• Compare diffusion, osmosis and active transport.

What’s Included

• 21-slide interactive lesson
• 13 self-marking activities: multiple-choice questions, true-or-false checks, sorting tasks, drag-and-drop categorising and fill-in-the-gap questions
• Step-by-step teaching cards that reveal one point at a time
• A written explanation task with a model answer for self-assessment

Why Teachers Love It

• No prep — open it on an interactive whiteboard, laptop or tablet
• Instant feedback explains every answer, right or wrong
• Everyday examples make biology feel real
• Works for whole-class teaching, independent study or revision

Curriculum Alignment

Supports UK GCSE Biology and Combined Science (AQA, Edexcel and OCR) and the Nigerian Senior Secondary Biology curriculum (SS1), including WAEC and NECO exam preparation.

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FAQ

What year groups is this for? Years 10–11 (ages 14–16), and SS1 in Nigeria.

Is it self-marking? Yes — all 13 activities give instant feedback.

Do pupils need to log in? No. The lesson runs in any modern web browser.

Can I use it for revision? Yes. Pupils can replay it as often as they like, and the results screen shows which questions to review before a test.