Answer:
Placentation – Arrangement of ovule within the ovary is known as placentation. Various types of placentations found in flowering plants are
(1) Marginal placentation
The placenta forms a ridge along through the ventral suture of the ovary, ovules are borne on the ridge to form two rows.
Example: Pea
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(2) Axile placentation
The placenta is axial and ovules are attached to it in a multilocular ovary.
Example: Lemon
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(3) Parietal placentation – Ovules develop on the inner wall of the ovary or on the peripheral. It is single-chambered, but due to the formation of a false septum, it becomes two-chambered.
Example: Mustard
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(4) Basal placentation – Placenta develops at the base of the ovary wherein a single ovule is attached to it.
Example: Marigold
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(5) Free central placentation – Ovules are borne on the central axis and septa are absent
Example: Primrose
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