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Question

Identify the different types of placentations shown in figure and select the correct option.



A
A-Axile, B-Marginal, C-Free central, D-Parietal, E-Basal
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B
A-Marginal, B-Basal, C-Axile,
D-Free central, E-Parietal
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C
A-Marginal, B-Axile, C-Parietal,
D-Free central, E-Basal
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D
A-Marginal, B-Parietal, C-Axile,
D-Basal, E-Free central
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Solution

The correct option is B A-Marginal, B-Basal, C-Axile,
D-Free central, E-Parietal

A is marginal placentation. In marginal placentation the placenta forms a ridge along the ventral surface of the ovary and the ovules are borne on this ridge forming two rows, as in pea.

B is basal placentation. In basal placentation, the placenta develops at the base of ovary and a single ovule is attached to it, as in sunflower and marigold.

C is axile placentation. In axile placentation, ovules are borne at or around the center of a compound ovary on an axis formed from joined septa., as in china rose, tomato and lemon.

D is free central placentation. In free central placentation, the ovules are borne on central axis and septa are absent, as in Dianthus and primrose.

E is parietal placentation. 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, e.g., mustard.


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