Describe the various types of placentations found in flowering plants and represent diagrammatically
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Answer:
Placentation – Arrangement of ovule within the ovary is known as placentation. Various types of placentations found in flowering plants are
(1) Marginal placentation
(1) Marginal placentationThe placenta forms a ridge along through the ventral suture of the ovary, ovules are borne on the ridge to form two rows.
(1) Marginal placentationThe placenta forms a ridge along through the ventral suture of the ovary, ovules are borne on the ridge to form two rows.Example: Pea
(2) Axile placentation
(2) Axile placentationThe placenta is axial and ovules are attached to it in a multilocular ovary.
(2) Axile placentationThe placenta is axial and ovules are attached to it in a multilocular ovary.Example: Lemon
(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.
(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
(4) Basal placentation – Placenta develops at the base of the ovary wherein a single ovule is attached to it.
(4) Basal placentation – Placenta develops at the base of the ovary wherein a single ovule is attached to it.Example: Marigold
(5) Free central placentation – Ovules are borne on the central axis and septa are absent
(5) Free central placentation – Ovules are borne on the central axis and septa are absentExample: Primrose
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