Eduprobe
Question:
Identify the given figures A, B, C, D, and E.
A: Marginal , B: Axile, C: Free central, D: Parietal, E: Basal
A: Marginal , B: Axile, C: Parietal, D: Free central, E: Basal
A: Marginal, B: Parietal, C: Free central, D: Axile, E: Basal
A: Marginal , B: Axile, C: Parietal, D: Basal, E: Free central
Solution:
These are different arrangements of ovule attachment to the inner surface of the 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.