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