What is placentation? describe it\'s types.

1.	What is placentation? describe it\'s types.
Answer» \tThe arrangement of ovules within the ovary is known as placentation.\tThe placentation is of different types namely, marginal, axile, parietal, basal, central and free central.\tIn 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\tWhen 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.\tIn 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\tIn free central, the ovules are borne on central axis and septa are absent. Example- Dianthus\tIn basal placentation, the placenta develops at the base of ovary and a single ovule is attached to it. Example – sunflower.

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