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Questions and Answers
What is the main function of the ovary?
What is the main function of the ovary?
- Producing pollen grains
- Secreting nectar for pollination
- Developing into seeds after fertilization (correct)
- Providing support to the stem
What does placentation refer to?
What does placentation refer to?
- The process of seed formation
- The arrangement of ovules within the ovary (correct)
- The development of pollen grains
- The transfer of pollen from anther to stigma
In what type of placentation are ovules attached along a central column?
In what type of placentation are ovules attached along a central column?
- Marginal placentation
- Free central placentation
- Parietal placentation
- Axile placentation (correct)
What does the pericarp of a fruit refer to?
What does the pericarp of a fruit refer to?
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What happens after fertilization in relation to the ovary?
What happens after fertilization in relation to the ovary?
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Which type of placentation forms a ridge along the ventral suture of the ovary?
Which type of placentation forms a ridge along the ventral suture of the ovary?
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What is the main role of placentation in a plant's reproductive system?
What is the main role of placentation in a plant's reproductive system?
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What does the false septum in an ovary signify?
What does the false septum in an ovary signify?
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Study Notes
Placenta in Flowers
- Placenta is the region where ovules are attached to the ovary wall
- Ovary is the female reproductive organ in flowers, and it can be one-chambered or two-chambered
- In some flowers, the placenta is along the ventral suture of the ovary, and ovules are arranged in a row (marginal placentation)
- In other flowers, the placenta is axial and ovules are attached to a multicellular ovary (axial placentation)
Types of Placenta
- Marginal placentation: ovules are arranged in a row along the ventral suture of the ovary
- Axial placentation: ovules are attached to a multicellular ovary
- Free-central placentation: ovules are attached to a central column in the ovary
- Paracentral placentation: ovules are attached to the ovary wall, but not along the ventral suture
Fruit Development
- After fertilization, the ovary develops into a fruit
- The pericarpe (fruit wall) can be dry or fleshy
- Each ovule develops into a seed, and each seed has an embryo and a stored food supply
- The fruit can have different types of placentation, depending on the type of ovary and ovule arrangement
Ovary Structure
- The ovary can be one-chambered or two-chambered
- The ovary wall has a placenta where ovules are attached
- The ovary can have different types of placentation, depending on the arrangement of ovules
- The ovary develops from a floral meristem, which is a group of undifferentiated cells
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