Single Choice

Identify the given figures A, B, C, D and E.

AA: Marginal , B: Axile, C: Free central, D: Parietal, E: Basal
BA: Marginal, B: Parietal, C: Free central, D: Axile, E: Basal
CA: Marginal , B: Axile, C: Parietal, D: Free central, E: Basal
Correct Answer
DA: Marginal , B: Axile, C: Parietal, D: Basal, E: Free central

Solution

These are different arrangements of ovule attachment to inner surface of ovary wall. (A) represents marginal, (B) represents axile, (C) represents parietal, (D) represents free central, (E) represents basal placentation.
Axile placentation - placenta bears ovules developing from the central axis of a compound ovary corresponding to the fused margins of carpels. e.g., Citrus, Solanum.
Basal placentation- placenta present on the base of the unilocular ovary. e.g., Sonchus.
Parietal placentation - placenta bears the ovules on the inner wall of the ovary and their position corresponds to the fused margins of carpels.The ovary is one chambered. e.g., Argemone.
Free-central placentation - the ovules are borne on a central column without any septa and the ovary is unilocular. e.g., Stellaria.

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