Answer:
Types of Placentations The arrangement of
ovules within, the ovary is known as placentation. The placentations are of
different types - marginal, axile, parietal, basal, central and free central.
Marginal placentation In this placentation,
the placenta forms a ridge along the ventral suture of the ovary and the ovules
are borne on this ridge forming two rows as in pea.
Axile placentation In this placentation, the
placenta is axile and the ovules are attached to it in a multilocular ovary as
in China rose, tomato, etc.
Parietal placentation In this placentation,
the ovules develop on the inner wall of the ovary or on peripheral part. Ovary
is one chambered but it becomes two chambered due to the formation of a false
septum known as replam, e.g., mustard.
Free central placentation In this type of
placentation, the ovules are present on the central axis of ovary and septa are
absent as in Dianthus and primrose.
Basal placentation In this placentation, the
placenta develops at the base of ovary and a single ovule is attached to it, as
in sunflower.
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