Gynoecium and Placentation
Study of the female reproductive part of the flower, including carpels (stigma, style, ovary), apocarpous and syncarpous conditions, and types of placentation (marginal, axile, parietal, basal, free central).
What is Gynoecium and Placentation?
The female reproductive organ of a flower, typically consisting of one or more carpels.
Key points
- Identify and describe the parts of the gynoecium.
- Differentiate between apocarpous and syncarpous gynoecia.
- Explain the concept of placentation.
- Classify and provide examples for each type of placentation.
Common exam trap
Confusing apocarpous and syncarpous gynoecium.
Definitions
- Term
Gynoecium
- Meaning
The female reproductive organ of a flower, typically consisting of one or more carpels.
- Term
Carpel
- Meaning
The basic unit of the gynoecium, consisting of stigma, style, and ovary.
- Term
Stigma
- Meaning
The receptive tip of a carpel, or of several fused carpels, in the gynoecium of a flower, responsible for receiving pollen.
- Term
Style
- Meaning
A stalk that connects the stigma to the ovary in a carpel.
- Term
Ovary
- Meaning
The enlarged basal portion of the pistil where ovules are produced.
- Term
Ovule
- Meaning
The structure within the ovary that develops into a seed after fertilization.
- Term
Apocarpous
- Meaning
Having carpels that are free and separate from each other.
- Term
Syncarpous
- Meaning
Having carpels that are fused together.
- Term
Placentation
- Meaning
The arrangement of ovules within the ovary.
- Term
Placenta
- Meaning
The part of the ovary wall to which the ovules are attached.
Learning objectives
Identify and describe the parts of the gynoecium.
Differentiate between apocarpous and syncarpous gynoecia.
Explain the concept of placentation.
Classify and provide examples for each type of placentation.
Prerequisites
Basic flower structure (sepals, petals, stamens, pistil).
Understanding of plant reproductive parts.
Common mistakes
Confusing apocarpous and syncarpous gynoecium.
Misidentifying the type of placentation based on ovary structure.
Incorrectly associating placentation types with specific plant families or examples.
Forgetting that the ovary wall develops into the fruit wall (pericarp).
Keywords
Gynoecium
Pistil
Carpel
Stigma
Style
Ovary
Ovule
Apocarpous
Syncarpous
Placentation
Marginal
Axile
Parietal
Basal
Free Central
Practice preview
Which of the following statements regarding placentation is INCORRECT?…
hard
Which of the following terms describes the arrangement of ovules within the ovary?…
easy
In which type of placentation are the ovules attached to the periphery of the ovary wall, with a single carpel and unilocular ovary?…
medium