83.Select the option in which placentation in ovary is correctly matches with examples: A. Basal- Marigold, Sunflower B. Marginal- China rose, Pea C. Free central- Mustard, Argemone D. Parietal- Lemon, Primrose
Option A. Basal: The ovary is unilocular and a single ovule is borne at the base of ovary. For example, Marigold, Sunflower (Asteraceae family). Free central : This type of placentation is found in syncarpous gynoecium. In it, the ovary is unilocular and the ovules are borne on the axis in the center of the ovary. The septum is absent in ovary. For example, Primrose, Dianthus (Caryophyllaceae). Parietal: This type of placentation is found in the unilocular syncarpous ovary. In it, the ovule develops on the inner wall of the ovary or on the peripheral part. Ovary becomes bi or multilocular due to the formation a false septum. For example, Cucurbita, Argemone and Cruciferae family (Mustard). Axile: It is found in multicarpellary syncarpous gynoecium. The fusion margin of carpels grows inward and meet in the centre of the ovary. Thus, an axis forms in the centre of ovary and ovary becomes multichambered. The ovules are borne at the central axis. A number of these chambers are equal to the number of the carpel. For example, Potato, China rose, Onion, Lemon, Orange, Tomato. Marginal: Marginal placentation is found in the unilocular ovary. The placenta forms a ridge along the ventral suture of the ovary and the ovules are borne on this ridge forming two rows. e.g., Leguminosae.
