describe different types of placentation
Answers
The formation or arrangement of placenta in a women's and female uterus.
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✓ Marginal placentation
• The ovary in which the placenta forms a ridge along the ventral suture of the ovary and the ovules develop on two separate rows is known to have marginal placentation.
• This type of placentation is found in peas.
✓ Free central placentation
• In free central placentation, the ovules develop on the central axis while the septa are absent.
• This type of placentation is found inDianthus and primrose.
✓ Basal placentation
• The ovary in which the placenta develops from its base and a single ovule is found attached to the base is said to have basal placentation.
• It is found in marigold and sunflower.
✓Parietal placentation
• When the ovules develop on the inner walls of the ovary, the ovary is said to have parietal placentation.
✓ Axile placentation
• In axile placentation, the placenta is axial and ovules are attached to it.
• Examples include China rose, lemon, and tomato.
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