Explain stigma style ovary and ovule functions within a carpel
Follow the receiving surface to the internal reproductive structures.
Mapped to the named 0654 section using teaching from the corresponding single-science course. A 0654-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.
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 organ contains ovules?
What you will learn
- Trace the carpel from top to base
- Distinguish an ovary from the ovules it contains
Explain stigma style ovary and ovule functions within a carpel
| 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 |
|---|---|
| Stigma | Receives pollen |
| Style | Connects stigma and ovary; pollen-tube route |
| Ovary | Contains ovules |
| Ovule | Contains the female reproductive cell |
Trace the carpel from top to base
The stigma is the pollen-receiving region of the carpel. In the chosen model it is at the top, connected by a slender style to the ovary. Its position and surface suit pollen reception, although stigma shape varies among species. Identifying a stigma does not require claiming that every stigma has exactly the same stickiness, colour or number of lobes.
The style connects stigma and ovary and is the route through which a pollen tube can grow in the supplied fertilisation sequence. The tube grows after compatible pollen reaches a receptive stigma; the style does not produce pollen grains or act as an ovule. Later Extended teaching follows the tube in detail, while the Core function here locates the connecting structure.
Distinguish an ovary from the ovules it contains
The ovary encloses ovules. An ovule contains the female reproductive cell with a nucleus that can fuse with the male reproductive nucleus. The enclosing ovary, an individual ovule and the female reproductive cell are therefore three different levels of structure. Do not call the entire ovary an egg cell or count every space visible in a section as a separate ovule without an identification key.
The combined stigma, style and ovary form the carpel grouping used in this model; ovules lie within its ovary. A real pistil may involve one carpel or several fused carpels, so the simple model does not impose one arrangement on all flowers. Identification and function should agree: receiving surface, connecting route, enclosing organ and contained reproductive structures.
Sources for this lesson
Pause and explain
Which function belongs to the stigma?
Worked example
A pollen tube is shown between a stigma and an ovary. Which named flower part contains that route?
Show the worked solution
- Locate the connection between the two.
- That connecting region is the style.
Answer The style.
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.
Give one function each for stigma, style and ovary.
Give me a hint
Follow reception, connection and enclosure.
Compare my reasoning
- Stigma receives pollen.
- Style provides the tube route; ovary contains ovules.
Stigma receives pollen; style provides the route toward the ovary for a pollen tube; ovary contains ovules.
Look for these in your work
- Assign all three functions
- Separate receiving and containing roles
Explain why an ovule and an ovary are not interchangeable labels.
Give me a hint
Use the enclosing relationship.
Compare my reasoning
- The ovary is an organ.
- Individual ovules lie inside it and contain female reproductive cells.
The ovary encloses ovules; an ovule is a contained structure with the female reproductive cell. They are different structures.
Look for these in your work
- State the enclosure relationship
- Retain the female reproductive-cell location
A cut section shows one ovary with four clearly keyed ovules. How many ovaries and ovules are shown, and does this establish four successful fertilisations?
Give me a hint
Count structures separately from events.
Compare my reasoning
- There is one enclosing ovary.
- Four ovules are shown but fusion events are not supplied.
One ovary and four ovules; the section alone does not establish four successful fertilisations.
Look for these in your work
- Count at both structural levels
- Do not infer events from anatomy alone
Common mistakes
- Calling the entire ovary an egg cell.
- Saying the style produces the pollen grains.
What can you explain now?
Which function belongs to the stigma?
Compare with the explanation
Receive pollen
Its role concerns the destination of pollen transfer.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Name the carpel regions and explain the ovary–ovule relationship.
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.