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What is placentation? describe it's types.

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What is placentation? describe it's types.

    • Posted by Yug Patel 4 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Yogita Ingle 4 years, 1 month ago

    • The arrangement of ovules within the ovary is known as placentation.
    • The placentation is of different types namely, marginal, axile, parietal, basal, central and free central.
    • In marginal placentation the placenta forms a ridge along the ventral suture of the ovary and the ovules are borne on this ridge forming two rows. Example- pea
    • When the placenta is axial and the ovules are attached to it in a multilocular ovary, the placentaion is said to be axile. Example- china rose.
    • In parietal placentation, the ovules develop on the inner wall of the ovary or on peripheral part and ovary become twochambered due to the formation of the false septum. Example- mustard
    • In free central, the ovules are borne on central axis and septa are absent. Example- Dianthus
    • In basal placentation, the placenta develops at the base of ovary and a single ovule is attached to it. Example – sunflower.

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