14 Questions
In which part of the flower is the ovule located in flowering plants?
Gynoecium
What structure attaches the ovule to the placenta in the ovary?
Funicle
What part of the ovule is responsible for producing an egg cell?
Female gametophyte
Which part of the ovary produces one or more ovules and ultimately becomes the fruit wall?
Ovary
What type of placentation has the placenta at the apex (top) of the ovary?
Apical placentation
In which type of placentation are placentae along fused margins of carpels?
Marginal placentation
What type of placentation has only one elongated placenta on one side of the ovary?
Parietal placentation
In which ovule orientation does the micropyle face the placenta when inverted?
Anatropous
What structure surrounds the megagametophyte and produces archegonia in the ovule?
Nucellus
Which type of placentation is similar to axile, but placentae are on inner surfaces of multilocular ovary?
Superficial placentation
What is the most common ovule orientation in flowering plants?
Anatropous
Which part of the ovule is composed of diploid maternal tissue, including a megasporocyte?
Megasporangium
In which type of placentation are placentae derived from axile as partitions are absorbed, leaving ovules at the central axis?
Free-central placentation
Where are ovules borne in gymnosperms such as conifers?
Within an ovulate cone
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.
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.
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