Podcast
Questions and Answers
In which part of the flower is the ovule located in flowering plants?
In which part of the flower is the ovule located in flowering plants?
- Gynoecium (correct)
- Androecium
- Sepal
- Petal
What structure attaches the ovule to the placenta in the ovary?
What structure attaches the ovule to the placenta in the ovary?
- Funicle (correct)
- Nucellus
- Megasporangium
- Integument
What part of the ovule is responsible for producing an egg cell?
What part of the ovule is responsible for producing an egg cell?
- Funicle
- Female gametophyte (correct)
- Integument
- Nucellus
Which part of the ovary produces one or more ovules and ultimately becomes the fruit wall?
Which part of the ovary produces one or more ovules and ultimately becomes the fruit wall?
What type of placentation has the placenta at the apex (top) of the ovary?
What type of placentation has the placenta at the apex (top) of the ovary?
In which type of placentation are placentae along fused margins of carpels?
In which type of placentation are placentae along fused margins of carpels?
What type of placentation has only one elongated placenta on one side of the ovary?
What type of placentation has only one elongated placenta on one side of the ovary?
In which ovule orientation does the micropyle face the placenta when inverted?
In which ovule orientation does the micropyle face the placenta when inverted?
What structure surrounds the megagametophyte and produces archegonia in the ovule?
What structure surrounds the megagametophyte and produces archegonia in the ovule?
Which type of placentation is similar to axile, but placentae are on inner surfaces of multilocular ovary?
Which type of placentation is similar to axile, but placentae are on inner surfaces of multilocular ovary?
What is the most common ovule orientation in flowering plants?
What is the most common ovule orientation in flowering plants?
Which part of the ovule is composed of diploid maternal tissue, including a megasporocyte?
Which part of the ovule is composed of diploid maternal tissue, including a megasporocyte?
In which type of placentation are placentae derived from axile as partitions are absorbed, leaving ovules at the central axis?
In which type of placentation are placentae derived from axile as partitions are absorbed, leaving ovules at the central axis?
Where are ovules borne in gymnosperms such as conifers?
Where are ovules borne in gymnosperms such as conifers?
Study Notes
Ovule Structure and Placentation
- In flowering plants, the ovule is located in the ovary.
- The ovule is attached to the placenta in the ovary by a structure called the funiculus.
- The megasporocyte, a part of the ovule, is responsible for producing an egg cell.
- The placenta region of the ovary produces one or more ovules and ultimately becomes the fruit wall.
Types of Placentation
- Apical placentation occurs when the placenta is located at the apex (top) of the ovary.
- Marginal placentation occurs when placentae are along fused margins of carpels.
- Parietal placentation occurs when there is only one elongated placenta on one side of the ovary.
- Axile placentation is similar to parietal, but placentae are on inner surfaces of a multilocular ovary.
- Free-central placentation occurs when placentae are derived from axile as partitions are absorbed, leaving ovules at the central axis.
Ovule Orientation and Development
- In the inverted ovule orientation, the micropyle faces the placenta.
- The integument surrounds the megagametophyte and produces archegonia in the ovule.
- The nucellus is composed of diploid maternal tissue, including a megasporocyte.
- The most common ovule orientation in flowering plants is anatropous.
Ovule Location in Gymnosperms
- In gymnosperms such as conifers, ovules are borne on the surface of the scales of the ovary.
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Description
Test your knowledge about the structure of ovule in seed plants, including its parts and functions in the female reproductive process. This quiz covers the integument, nucellus, female gametophyte, and the role of the ovule in fertilization.
