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Describe the various types of placentation found in flowering plants. |
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Answer» Placentation is primarily of five types: Marginal, basal, parietal, axile, and free central. (a) 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. E.g. Peas (b) Parietal placentation: When the ovules develop on the inner walls of the ovary, the ovary is said to have parietal placentation. E.g., mustard and Argemone (c) Axile placentation: In axile placentation, the placenta is axial and ovules are attached to it. E.g. China rose, lemon, and tomato. (d) 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. E.g. marigold and sunflower (e) Free central placentation: In free central placentation, the ovules develop on the central axis while the septa are absent. E.g. Dianthus and primrose |
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