Locate all ten flower structures in a cutaway model
Read the flower as connected parts rather than ten unrelated labels.
Cross-referenced to the 2028–2029 0653 section using original teaching from the related single-science courses. A 0653-specific objective-by-objective and Core/Supplement review is in progress. Written practice is self-checked and does not demonstrate supervised laboratory competence or award an official Cambridge grade.
Before you begin
- Recall gametes, nuclear fusion, cellular respiration and the distinction between reproduction and growth.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which pair makes one stamen?
What you will learn
- Locate the protective and reproductive parts
- Connect the groups with their smaller structures
Locate all ten flower structures in a cutaway model
| Feature | Meaning |
|---|---|
| 1 · Sepals | Protect the developing bud |
| 2 · Petals | Can attract insect visitors |
| 3 · Anther | Produces pollen grains |
| 4 · Filament | Supports and positions anther |
| 5 · Stigma | Receives pollen |
| 6 · Style | Connection and pollen-tube route |
| 7 · Ovary | Contains ovules |
| 8 · Ovules | Contain female reproductive cells |
| 9 · Stamen | Complete anther + filament unit (3 + 4) |
| 10 · Carpel | Includes stigma, style and ovary (5 + 6 + 7) |
| Feature | Meaning |
|---|---|
| Sepals | Protect the developing bud |
| Petals | Can attract insect visitors |
| Stamen | Anther supported by filament |
| Carpel | Stigma, style and ovary; ovary contains ovules |
Locate the protective and reproductive parts
The original cutaway represents one simplified insect-pollinated flower. Sepals lie around the outside near its base and protect the developing bud. Petals surround the reproductive structures and can help attract visiting insects. Their positions in this model provide evidence for labelling; a real flower may have fused parts or a different arrangement, so do not identify every structure from colour alone.
A stamen consists of an anther supported by a filament. The anther produces pollen grains, while the filament holds the anther in a suitable position for pollen transfer. Stamen names the complete unit, not a third free-standing organ alongside its anther and filament. Follow the connection between the two smaller structures when identifying a stamen in a diagram or photograph.
Connect the groups with their smaller structures
A carpel includes a stigma, style and ovary. The stigma receives pollen; the style connects it with the ovary and provides the route through which a pollen tube can grow. The ovary contains ovules, and an ovule contains the female reproductive cell whose nucleus can participate in fertilisation. Ovary and ovule are different structures, even when a cutaway shows one inside the other.
The ten required names include both complete groups and their parts: sepals, petals, stamens, filaments, anthers, carpels, style, stigma, ovary and ovules. The cutaway exposes internal ovules for teaching; it does not imply they are visible through an intact living ovary. Use the separate published photographs to practise real identification, and state when a surface view hides a required internal part.
Sources for this lesson
Pause and explain
What lies inside the ovary in this cutaway?
Worked example
A key points to a swollen central base and the small bodies inside it. Name each.
Show the worked solution
- The swollen base belongs to the carpel.
- The smaller internal bodies are enclosed by it.
Answer Swollen base: ovary. Internal bodies: ovules.
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 complete unit formed by an anther and its supporting filament.
Give me a hint
Identify the group rather than only one part.
Compare my reasoning
- Anther and filament are connected.
- Together they form one stamen.
Stamen.
Look for these in your work
- Use the complete-group name
- Retain its two-part relationship
Name the stigma, style, ovary and ovules by their relationships in the cutaway.
Give me a hint
Begin at the pollen-receiving surface.
Compare my reasoning
- Stigma is the receiving surface; style connects downward.
- Ovary is the swollen base; ovules are inside.
Stigma receives pollen; style connects to the ovary; the ovary contains ovules.
Look for these in your work
- Locate the three carpel regions
- Place ovules inside the ovary
An intact flower photograph does not reveal internal ovules. Should a label point to any visible small dot and call it an ovule?
Give me a hint
Use the boundaries of the photograph.
Compare my reasoning
- Internal structures may be hidden.
- A random surface dot is not anatomical evidence.
No. State that ovules are hidden in this surface view and use a verified cut section or internal diagram to identify them.
Look for these in your work
- Reject unsupported identification
- Choose stronger internal evidence
Common mistakes
- Treating stamen and anther as separate complete units.
- Calling the ovary and an ovule the same part.
What can you explain now?
What lies inside the ovary in this cutaway?
Compare with the explanation
Ovules
The ovary contains them.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Locate and name all ten required structures, including the complete groups.
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.