LAUNCH · GCSE Biology · Week 5 · Do
Analyse & Evaluate Osmosis Data
🎯 Learning objective: I can graph and interpret osmosis data, estimate the no-net-change concentration and evaluate method.
✅ Success criteria
- Plot/interpret concentration vs % mass change.
- Explain positive/negative/zero using osmosis.
- Evaluate a specific method issue and improvement.
ArrivalStarterI DoWe DoI Do 2We Do 2IndependentExit
🧬 Edexcel GCSE Biology 1BI0 Foundation · Paper 1 · Topic 1🧪 Osmosis Data Studio⏱ 40 minutes
💧
Do → Osmosis Data Studioobserve · predict · test · explain · applyQUESTIONEVIDENCEPATTERNEXPLANATIONAPPLICATIONEVALUATION
LAUNCH rule: the explanation is earned by observation, prediction, measurement, testing or reasoning from evidence.
🛡 SPACE
🗣 VOICE
👂 AUDIENCE
⚙ INFLUENCE
Stable conditions and clear expectations make GCSE thinking possible.
⏱ 3 min
🚪 Arrival · previous learningRetrieve the previous learning: W5L2 concentration, % mass change and controls. A positive % change means mass was gained.
Not here last lesson? Everything you need is in the box above — read it, then answer.
◆ Supported — three retrieval questions and one lead-in
R1 Last lesson
Point to the balance you used.
Non-reading route: point to it, say it, or show it. An adult can scribe your exact words. Next step up: Standard — Last lesson you ran the osmosis practical. Which variable did you change, and which did you keep the same?
R2 Week 5 · lesson 1
Say which way water moves in osmosis.
Non-reading route: point to it, say it, or show it. An adult can scribe your exact words. Next step up: Standard — Week 5: define osmosis using the words membrane and concentration.
R3 Week 4
Point to the crowded side of the diagram.
Non-reading route: point to it, say it, or show it. An adult can scribe your exact words. Next step up: Standard — Week 4: define diffusion and name one factor affecting its rate.
Lead-in Into today
Look at the graph. Point to where the line crosses zero.
Non-reading route: point to it, say it, or show it. An adult can scribe your exact words. Next step up: Standard — Somewhere between your concentrations, the potato neither gains nor loses mass. How would you find it?
▲ Standard — three retrieval questions and one lead-in
R1 Last lesson
Last lesson you ran the osmosis practical. Which variable did you change, and which did you keep the same?
Non-reading route: point to it, say it, or show it. An adult can scribe your exact words. Next step up: Stretch — Last lesson: explain why percentage change was the right measure for comparing pieces.
R2 Week 5 · lesson 1
Week 5: define osmosis using the words membrane and concentration.
Non-reading route: point to it, say it, or show it. An adult can scribe your exact words. Next step up: Stretch — Week 5: explain what happens to a cell placed in pure water, and why.
R3 Week 4
Week 4: define diffusion and name one factor affecting its rate.
Non-reading route: point to it, say it, or show it. An adult can scribe your exact words. Next step up: Stretch — Week 4: explain how diffusion and osmosis are related but not identical.
Lead-in Into today
Somewhere between your concentrations, the potato neither gains nor loses mass. How would you find it?
Non-reading route: point to it, say it, or show it. An adult can scribe your exact words. Next step up: Stretch — Explain what the crossing point tells you about the solution inside the potato cells.
★ Stretch — three retrieval questions and one lead-in
R1 Last lesson
Last lesson: explain why percentage change was the right measure for comparing pieces.
Non-reading route: point to it, say it, or show it. An adult can scribe your exact words. Next step up: Supported — Point to the balance you used.
R2 Week 5 · lesson 1
Week 5: explain what happens to a cell placed in pure water, and why.
Non-reading route: point to it, say it, or show it. An adult can scribe your exact words. Next step up: Supported — Say which way water moves in osmosis.
R3 Week 4
Week 4: explain how diffusion and osmosis are related but not identical.
Non-reading route: point to it, say it, or show it. An adult can scribe your exact words. Next step up: Supported — Point to the crowded side of the diagram.
Lead-in Into today
Explain what the crossing point tells you about the solution inside the potato cells.
Non-reading route: point to it, say it, or show it. An adult can scribe your exact words. Next step up: Supported — Look at the graph. Point to where the line crosses zero.
Arrival retrieves three times, then leads in. R1 is last lesson, R2 is earlier this week, R3 is older material, and the lead-in opens today without teaching today’s concept.
LAUNCH response routes
📝 write / edit🗣 structured verbal📏 measure / calculate📊 graph / interpret🧪 practical / demonstrate🔁 re-attempt
Access changes the response route, not the GCSE Biology entitlement.
QUESTIONEVIDENCEPATTERNEXPLANATIONAPPLICATIONEVALUATION
LAUNCH rule: the explanation is earned by observation, prediction, measurement, testing or reasoning from evidence.
🛡 SPACE
🗣 VOICE
👂 AUDIENCE
⚙ INFLUENCE
Quiet retrieval before new demand; uncertainty is information, not public failure.
⏱ 3 min
🌱 Starter · observe / predict🔍 Scientific question
Your graph crosses 0% between two concentrations. Why is that crossing biologically interesting?
FRAME 1/4
PLOT VARIABLES
Pause for observation or prediction before advancing.
FRAME 2/4
READ PATTERN
Pause for observation or prediction before advancing.
FRAME 3/4
FIND ZERO CROSSING
Pause for observation or prediction before advancing.
FRAME 4/4
EVALUATE METHOD
Pause for observation or prediction before advancing.
🎯 Commit to a prediction
Before we plot: what would the zero-change concentration tell you?
Choose one. Say it, point to it, or press it.
Nothing here is right or wrong yet, and nothing is marked, scored or stored. A prediction is still worth having when it turns out differently — that is what makes the test worth running.
LAUNCH response routes
📝 write / edit🗣 structured verbal📏 measure / calculate📊 graph / interpret🧪 practical / demonstrate🔁 re-attempt
Access changes the response route, not the GCSE Biology entitlement.
QUESTIONEVIDENCEPATTERNEXPLANATIONAPPLICATIONEVALUATION
LAUNCH rule: the explanation is earned by observation, prediction, measurement, testing or reasoning from evidence.
🛡 SPACE
🗣 VOICE
👂 AUDIENCE
⚙ INFLUENCE
Prediction/observation precedes explanation.
⏱ 4 min
👩🏫 I Do · model the reasoning🧠 Teacher reasoning model — reveal only after the class has observed/predicted.
STEP Choose axes from variables.
STEP Plot honestly, including variation.
STEP Identify zero crossing as estimate of little/no net movement.
✔ What this model helps us seeIt shows the trend across all concentrations, including the point where the change is zero.
✘ What this model does not showIt leaves out the uncertainty in every plotted point — a smooth line through scattered results looks more certain than the data actually is.
QUESTIONEVIDENCEPATTERNEXPLANATIONAPPLICATIONEVALUATION
LAUNCH rule: the explanation is earned by observation, prediction, measurement, testing or reasoning from evidence.
🛡 SPACE
🗣 VOICE
👂 AUDIENCE
⚙ INFLUENCE
Teacher models scientific reasoning; staff watch access and the point where the idea lands.
⏱ 4 min
🤝 We Do · hinge & responseCommit before reveal: What does the graph crossing 0% change indicate?
Answer first. The reveal is earned by the response, not by a timer.
LAUNCH response routes
📝 write / edit🗣 structured verbal📏 measure / calculate📊 graph / interpret🧪 practical / demonstrate🔁 re-attempt
Access changes the response route, not the GCSE Biology entitlement.
QUESTIONEVIDENCEPATTERNEXPLANATIONAPPLICATIONEVALUATION
LAUNCH rule: the explanation is earned by observation, prediction, measurement, testing or reasoning from evidence.
🛡 SPACE
🗣 VOICE
👂 AUDIENCE
⚙ INFLUENCE
Adult genuinely receives the response; the next question, explanation or scaffold changes because of it.
⏱ 3 min
👩🏫 I Do 2 · connect / extend🧠 Teacher reasoning model — reveal only after the class has observed/predicted.
STEP Separate random variation from method problem.
STEP Evaluate blotting/size/time/concentration/repeats specifically.
STEP Do not claim greater precision than the graph supports.
QUESTIONEVIDENCEPATTERNEXPLANATIONAPPLICATIONEVALUATION
LAUNCH rule: the explanation is earned by observation, prediction, measurement, testing or reasoning from evidence.
🛡 SPACE
🗣 VOICE
👂 AUDIENCE
⚙ INFLUENCE
Teacher models scientific reasoning; staff watch access and the point where the idea lands.
⏱ 4 min
🤝 We Do 2 · scientific model / dataInteractive reasoning: predict/observe first → use the model → explain the evidence → adult receives it.
📊 Osmosis data studio
Read the pattern first. A zero crossing is an estimate, not an exact magic answer.
📉 Anomaly and zero lab
The studio above plots your own class results. This lab is button-only. It carries one fixed practice data set — the same numbers for every pupil, generated by a seeded rule ported from the fixture file — so anomaly decisions can be practised before you touch real data.
Step 1 · Predict, before you test
Somewhere between gaining and losing mass there is a concentration with NO change. In this data set, where will it sit?
Choose one. Say it, point to it, or press it. Nothing here is right or wrong yet.
Step 2 · Work the data set
Work left to right: means, then the odd result, then the estimate.
Frozen results — these stay on the page
Nothing tested yet.
Step 3 · Explain
SCIENCE GLITCH: “An odd result should be rubbed out so the graph looks right.”
Use your frozen list as the evidence. Decide, then say why.
Every step is a button, and each option carries a shape and a word as well as its colour. Say it, point to it or have an adult press it — the route does not change the Biology. The practice numbers are seeded, so they are identical for every pupil; your own class data belongs in the studio above.
LAUNCH response routes
📝 write / edit🗣 structured verbal📏 measure / calculate📊 graph / interpret🧪 practical / demonstrate🔁 re-attempt
Access changes the response route, not the GCSE Biology entitlement.
QUESTIONEVIDENCEPATTERNEXPLANATIONAPPLICATIONEVALUATION
LAUNCH rule: the explanation is earned by observation, prediction, measurement, testing or reasoning from evidence.
🛡 SPACE
🗣 VOICE
👂 AUDIENCE
⚙ INFLUENCE
Adult genuinely receives the response; the next question, explanation or scaffold changes because of it.
⏱ 15 min
✏️ Independent · evidence & transfer✏️ Independent GCSE Biology
Enter your data. Plot the points. Find the pattern. Find the zero crossing. Answer the interpretation questions. Evaluate your method. Add one improvement. Link it to that method.
🧪 PRACTICAL / EVIDENCE READY
EquipmentGraph paper or local SVG graph tool; calculator; class dataset; ruler.
Safety / accessNo practical hazard; graph support is an access scaffold.
Evidence targetGraph interpretation + zero-crossing estimate + method improvement.
15 minutes. Supported / Standard / Stretch are movable routes, not grade identities.
◆ The graph is part-prepared. Prompts guide you.
Axes and scale are given. Use the gain or loss frame.
Fade: remove the first prompt that no longer changes success.
▲ Plot it all. Estimate the crossing. Explain two points.
Claim → graph evidence → osmosis explanation.
Fade: remove the first prompt that no longer changes success.
★ Plot it. Interpret it. Evaluate the uncertainty. Justify one improvement.
One value is an estimate. One was measured directly. Keep them apart.
Fade: remove the first prompt that no longer changes success.
1 · Learner decisionprediction, plan, command-word choice or calculation set-up
2 · Observable Sciencemeasurement, graph, working, model, practical result or answer
3 · Learner responseexplanation, evaluation, edit or re-attempt after feedback
📖 WORD HELP
percentage changethe change compared with what you started with, as a percentage
evaluatejudge how good the method or evidence was, and say why
evidencethe data your conclusion rests on
Use the Biology word first. Ask for help only when you need it. TA fade route: model the word. Then prompt for it. Then wait for it. Drop a step as soon as the pupil no longer needs it.
LAUNCH response routes
📝 write / edit🗣 structured verbal📏 measure / calculate📊 graph / interpret🧪 practical / demonstrate🔁 re-attempt
Access changes the response route, not the GCSE Biology entitlement.
QUESTIONEVIDENCEPATTERNEXPLANATIONAPPLICATIONEVALUATION
LAUNCH rule: the explanation is earned by observation, prediction, measurement, testing or reasoning from evidence.
🛡 SPACE
🗣 VOICE
👂 AUDIENCE
⚙ INFLUENCE
Pupil reasoning stays attributable; feedback produces an edit, re-attempt, calculation, explanation or application.
⏱ 4 min
🎫 Exit · receive and use the response◆ Supported
What does 0% mass change mean?
▲ Standard
Why can potato lose mass in concentrated solution?
★ Stretch
Give a specific improvement and what variation it reduces.
🔁 LAUNCH Lundy close — use the existing work
1) Pupil answers / edits / re-attempts. 2) Adult genuinely reads, listens or watches and names back what was received. 3) Where appropriate, the pupil adds the single response/next-step line on the same work: “I changed / next I will …”
No adult signature/countersignature. If local policy uses R, it follows genuine Audience only; this page never adds it automatically.
Closing the loop: this one ends on paper — your own hand, or your words scribed by an adult. Saying it aloud starts the loop; writing it is what closes it. Pass is always allowed.
What I said, and what it changed:
LAUNCH response routes
📝 write / edit🗣 structured verbal📏 measure / calculate📊 graph / interpret🧪 practical / demonstrate🔁 re-attempt
Access changes the response route, not the GCSE Biology entitlement.
QUESTIONEVIDENCEPATTERNEXPLANATIONAPPLICATIONEVALUATION
LAUNCH rule: the explanation is earned by observation, prediction, measurement, testing or reasoning from evidence.
🛡 SPACE
🗣 VOICE
👂 AUDIENCE
⚙ INFLUENCE
LAUNCH response stays on the existing work; adult genuinely receives it, then the next learning move changes.