1. Definition
What is a stem cell?
Help beside the question
Read or point first. Unspecialised; can divide and differentiate.
Answer guidance
An unspecialised cell that can divide and develop into specialised cell types.
Stem cells and meristems: compare potential
Learning objective
Compare embryonic stem cells, adult stem cells and plant meristems without overstating their potential.
40 minutes · one route · start from what you show today. Point, speak, sign, draw, write or direct an adult. An adult may read or scribe your exact words. Choose one route; do not complete all three.
LAUNCH · GCSE BIOLOGY FOUNDATION · W10 · LESSON 2 · 4 MINUTES
Four clues to start
Supported · 4 questions
2. Location
Where are meristems found?
Help beside the question
Read or point first. Look at growing root and shoot tips.
Answer guidance
At growing root and shoot tips, and other plant growth regions.
3. Potential
Which usually has wider potential: an embryonic stem cell or an adult blood stem cell?
Help beside the question
Read or point first. Compare many cell types with blood-cell types.
Answer guidance
An embryonic stem cell.
4. Word care
Does “adult stem cell” mean it can become any cell in the body?
Help beside the question
Read or point first. Use the idea of limited potential.
Answer guidance
No; most adult stem cells have a more limited range of possible cell types.
Standard · 4 questions
1. Definition
What is a stem cell?
Help beside the question
Unspecialised; can divide and differentiate.
Answer guidance
An unspecialised cell that can divide and develop into specialised cell types.
2. Location
Where are meristems found?
Help beside the question
Look at growing root and shoot tips.
Answer guidance
At growing root and shoot tips, and other plant growth regions.
3. Potential
Which usually has wider potential: an embryonic stem cell or an adult blood stem cell?
Help beside the question
Compare many cell types with blood-cell types.
Answer guidance
An embryonic stem cell.
4. Word care
Does “adult stem cell” mean it can become any cell in the body?
Help beside the question
Use the idea of limited potential.
Answer guidance
No; most adult stem cells have a more limited range of possible cell types.
Stretch · 4 questions
1. Definition
What is a stem cell?
Help beside the question
Unspecialised; can divide and differentiate.
Answer guidance
An unspecialised cell that can divide and develop into specialised cell types.
2. Location
Where are meristems found?
Help beside the question
Look at growing root and shoot tips.
Answer guidance
At growing root and shoot tips, and other plant growth regions.
3. Potential
Which usually has wider potential: an embryonic stem cell or an adult blood stem cell?
Help beside the question
Compare many cell types with blood-cell types.
Answer guidance
An embryonic stem cell.
4. Word care
Does “adult stem cell” mean it can become any cell in the body? Give a reason.
Help beside the question
Use the idea of limited potential.
Answer guidance
No; most adult stem cells have a more limited range of possible cell types. Accept a scientifically correct reason that uses the relevant model or evidence.
LAUNCH · GCSE BIOLOGY FOUNDATION · W10 · LESSON 2 · 4 MINUTES
Choose a first idea
Which statement is best?
Think or discuss first. No answer chosen yet.
LAUNCH · GCSE BIOLOGY FOUNDATION · W10 · LESSON 2 · 5 MINUTES
Watch the model
Mitosis increases cell number. New cells can grow before they divide again.
Worked explanation · reveal after thinking
Do not equate growth only with mitosis. Meristems are regions, not the name of every plant stem cell. Differentiation changes cell structure and gene activity; it does not normally remove the other genes.
32-second silent captioned explainer · optional
No sound or autoplay. Use instead of part of the modelling time, not as an extra activity.
Full transcript
More cells. Mitosis increases cell number. New cells can grow before they divide again.
Longer cells. Plant cells can elongate. A longer root is not proof that every cell has divided.
Different jobs. Differentiation produces cells with specialised structures, such as root hair cells or neurones.
Where growth begins. Meristems contain cells that keep dividing. New cells can elongate and differentiate.
LAUNCH · GCSE BIOLOGY FOUNDATION · W10 · LESSON 2 · 5 MINUTES
Sort using the evidence
Choose a card, then choose a group. Explain one placement using its clue.
Drag, or use Tab and Enter to select a card and its group. Pointing or adult-directed placement works too.
Embryonic stem cells
Adult blood stem cells
Plant meristems
Choose a card first.
Read the card clues
Early embryo source: Cells can produce many body-cell types.
Wide differentiation potential: This does not mean a guaranteed safe treatment.
Found in bone marrow: Blood stem cells form different blood-cell types.
Replenish blood-cell types: Potential is more restricted than embryonic cells.
Growing root or shoot tips: Meristems contain dividing unspecialised cells.
New plant tissues: New cells can elongate and differentiate.
Would a small change help? · optional
Ask the lesson teacher for clearer labels, fewer cards, reading help, an adult-directed model or more thinking time. Your teacher will explain what can change, try it and check its effect. Ask privately or pass; no extra form is needed.
Group explanations · reveal after sorting
Early embryo source → Embryonic stem cells. Cells can produce many body-cell types.
Wide differentiation potential → Embryonic stem cells. This does not mean a guaranteed safe treatment.
Found in bone marrow → Adult blood stem cells. Blood stem cells form different blood-cell types.
Replenish blood-cell types → Adult blood stem cells. Potential is more restricted than embryonic cells.
Growing root or shoot tips → Plant meristems. Meristems contain dividing unspecialised cells.
New plant tissues → Plant meristems. New cells can elongate and differentiate.
LAUNCH · GCSE BIOLOGY FOUNDATION · W10 · LESSON 2 · 4 MINUTES
Work through one example
Worked example
An adult blood stem cell produces several blood-cell types. What does that show?
Step 1
Identify the source: an adult blood stem cell.
Step 2
The observed range is blood-cell types.
Step 3
This supports differentiation within that range.
Step 4
It does not show that the cell can form every body tissue.
LAUNCH · GCSE BIOLOGY FOUNDATION · W10 · LESSON 2 · 4 MINUTES
Match a source to a justified claim
Compare potential and use. Keep “can produce a cell type” separate from “is proven safe as a treatment”.
| Source | Model potential | What this does not prove |
|---|---|---|
| Embryonic stem cells | Many body-cell types | A treatment is safe in people |
| Adult blood stem cells | Different blood-cell types | They can form every organ |
| Plant meristem | New plant cells and tissues | It is an animal treatment |
Worked explanation · reveal after thinking
Potential describes possible differentiation. Clinical safety and usefulness require separate evidence; plant meristems must not be treated as human stem-cell therapies.
LAUNCH · GCSE BIOLOGY FOUNDATION · W10 · LESSON 2 · 10 MINUTES
Show your understanding
Supported · choose one route
1. Compare
Complete a three-source comparison using location and potential.
Make three rows: embryonic / adult blood / meristem. Add where it is found and its observed potential.
2. Correct
Correct “all stem cells can become any body cell”.
Complete: the evidence shows ___ cell types, but does not show ___. Use the adult blood example.
3. Apply
Why can a plant cutting grow new tissues?
Order these ideas: specialised cells / cell division / unspecialised cells. Explain one link with “because”.
Standard · choose one route
1. Compare
Complete a three-source comparison using location and potential.
Use the supplied table or point to its evidence.
2. Correct
Correct “all stem cells can become any body cell”.
Name the restricted example.
3. Apply
Why can a plant cutting grow new tissues?
Link plant stem cells, division and differentiation.
Stretch · choose one route
1. Compare
Complete a three-source comparison using location and potential.
Use the supplied table or point to its evidence.
2. Correct
Correct “all stem cells can become any body cell”.
Name the restricted example.
3. Evaluate
A stem cell forms nerve-like cells in a dish. Does this prove it will repair a human spinal cord?
Distinguish laboratory potential from clinical evidence.
LAUNCH · GCSE BIOLOGY FOUNDATION · W10 · LESSON 2 · 4 MINUTES
Two small checks
Supported · 2 questions
1. Compare
Give one difference between embryonic and adult stem-cell potential.
Help beside the question
Use: both ___; a difference is ___. Use wider and more limited, not all adult cells.
Answer guidance
Embryonic stem cells can form many cell types; most adult stem cells have a more limited range.
2. Locate
Explain why a growing root tip contains a meristem.
Help beside the question
Use: my answer is ___ because ___. Point to a model or card first. New cells are needed for growth.
Answer guidance
Meristem cells divide to provide new cells, which can elongate and differentiate.
Standard · 2 questions
1. Compare
Give one difference between embryonic and adult stem-cell potential.
Help beside the question
Use wider and more limited, not all adult cells.
Answer guidance
Embryonic stem cells can form many cell types; most adult stem cells have a more limited range.
2. Locate
Explain why a growing root tip contains a meristem.
Help beside the question
New cells are needed for growth.
Answer guidance
Meristem cells divide to provide new cells, which can elongate and differentiate.
Stretch · 2 questions
1. Compare
Give one difference between embryonic and adult stem-cell potential.
Help beside the question
Use wider and more limited, not all adult cells.
Answer guidance
Embryonic stem cells can form many cell types; most adult stem cells have a more limited range.
2. Evaluate
A stem cell forms nerve-like cells in a dish. Does this prove it will repair a human spinal cord?
Help beside the question
Distinguish laboratory potential from clinical evidence.
Answer guidance
No. Survival, correct function, integration, safety and benefits in people still need evidence.
Keep one useful science explanation. No additional participation record is required.