Identify potato stem tubers as vegetative propagation
Use eyes and new shoots rather than treating a tuber as a seed.
Section B15.1 · Asexual reproduction
Exam scope and assessment notes
Mapped to the named 0973 section using teaching from the corresponding single-science course. A 0973-specific review of every Core and Supplement objective is still in progress. Written practice is self-checked; it does not demonstrate supervised laboratory competence or award an official Cambridge grade. This qualification reports two grades on the 9–1 scale; confirm the entry route for your zone and exam series.
Before you begin
- Recall cells, DNA, inherited characteristics and the distinction between growth of an organism and production of offspring.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What is an eye on a potato tuber?
What you will learn
- Recognise a stem tuber and its buds
- Follow vegetative origin through a stated sequence
Identify potato stem tubers as vegetative propagation
| Feature | Meaning |
|---|---|
| Organ | Swollen underground stem storing food |
| Eye | Vegetative bud |
| New plant | Develops from a viable bud |
| Naming limit | Seed potato is a planting term for a tuber |
Recognise a stem tuber and its buds
A potato tuber is a swollen underground stem that stores food. Its eyes are buds capable of producing new shoots. In the supplied propagation sequence, a tuber with a viable bud develops a new plant without fusion of gamete nuclei. The plant comes from vegetative material of the parent and is expected to share its genotype in the no-mutation copying model.
The potato tuber is not a botanical seed. Growers may use the term seed potato for a tuber used for planting, but the everyday term does not change the organ or reproductive mechanism. A true seed formed after a supplied fertilisation event is a different route. Identify whether the question shows a tuber bud or a fertilised ovule rather than relying only on the word seed.
Follow vegetative origin through a stated sequence
The diagram labels the storage stem, an eye or bud, a developing shoot and the later plant. Stored food supports early development, but food storage alone is not proof of reproduction: a storage organ with no viable growing point may fail to produce a new plant. Use the supplied viable-bud condition before predicting an offspring.
Not every enlarged underground organ is a potato-type stem tuber. Other plants can have swollen roots or different storage structures. This lesson specifically identifies potato stem tubers and does not ask learners to classify all crop organs from one shape. An image can support organ recognition, while the reproductive sequence supplies the one-parent origin and development.
Sources for this lesson
Pause and explain
Does the term seed potato alone make the tuber a botanical seed?
Worked example
A seed potato is described as a tuber whose eye grows into a shoot. Is this the fertilised-seed route?
Show the worked solution
- The planting material is a stem tuber.
- The eye is a vegetative bud, not a fused-gamete seed.
Answer No. This is vegetative asexual propagation from a potato stem tuber, despite the planting term seed potato.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Name the organ and growing structure shown in the potato diagram.
Give me a hint
Use tuber and eye correctly.
Compare my reasoning
- The swollen storage organ is a stem tuber.
- An eye is a bud that can make a shoot.
Potato stem tuber; eye or bud producing a new shoot.
Look for these in your work
- Identify stem tuber
- Identify eye as bud
Explain why the supplied tuber-to-plant sequence is asexual.
Give me a hint
Trace the vegetative source.
Compare my reasoning
- A bud on one parent’s tuber develops.
- There is no gamete fusion in the supplied sequence.
The plant develops from a vegetative bud on one parent’s tuber without gamete fusion; it is genetically identical in the no-mutation copying model.
Look for these in your work
- Trace one-parent source
- Link to clone model
A supplied piece of storage tissue has food but no viable bud. Does stored food alone establish successful propagation?
Give me a hint
A new plant needs a growing point, not only reserves.
Compare my reasoning
- Stored food is a resource.
- No viable growing point or offspring development is established.
No. Food storage alone does not establish a new plant; the supplied record lacks a viable bud and evidence of offspring development.
Look for these in your work
- Separate reserves from growing point
- Retain the supplied limit
Common mistakes
- Calling a potato tuber a true seed.
- Calling every underground storage organ a potato stem tuber.
What can you explain now?
Does the term seed potato alone make the tuber a botanical seed?
Compare with the explanation
No; the organ is still a stem tuber
Classify the organ and origin rather than the everyday term.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Explain why a seed potato is a vegetative stem tuber and identify the role of its eye.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.