Placentation in plants | Quick Bytes | Dr Sarita Kothari Bio Excel Nagpur.

Quick Revision and explanation of Placentation in plants in Biology NEET
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Classification based on arrangement of Ovules
Arrangement of ovules inside an ovary is termed as placentation.
The placentation are of different types:
Marginal
Axile
Parietal
Basal
Central
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, as in pea.
When the placenta is axial and the ovules are attached to it in a multilocular ovary, the placentation is said to be axile, as in china rose, tomato and lemon.
In parietal 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 the false septum (replum), e.g., mustard and Argemone.
When the ovules are borne on central axis and septa are absent, as in Dianthus and Primrose the placentation is called free central.
In basal placentation, the placenta develops at the base of ovary and a single ovule is attached to it, as in sunflower, marigold.
Question : Free central placentation is found in (NEET 2016)
Dianthus
Argemone
Brassica
Citrus
Correct Answer is Dianthus

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