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Question

In which of the following placentation, ovules are borne on central axis and septa are absent?

A
Marginal
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B
Axile
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C
Parietal
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D
Free central
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Solution

The correct option is D Free central
The arrangement of ovules within the ovary is known as placentation. The placentation are of different types namely, marginal, axile, parietal, basal, central and free central.
  • When the ovules are borne on central axis and septa are absent, as in Dianthus and Primrose the placentation is called 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 e.g., mustard and argemone.
  • In basal placentation, the placenta develops at the base of ovary and a single ovule is attached to it, as in sunflower, marigold.

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