Parietal placentation examples?

Parietal placentation examples?

• A. Mustard, Argemone
• B. China Rose, Tomato
• C. Mustard, Datura
• D. Dianthus, Primrose

Answer: (A)

Parietal placentation is when ovules develop on the inner surface of the ovary wall, with placental tissue arising from the walls themselves. This tends to occur in multicarpellate or syncar­pous ovaries where the placentas line the walls rather than forming a central column. Mustard and Argemone are classic examples because in both, the ovules are borne along the inner surfaces of the ovary walls. The ovary walls themselves provide the placental tissue, matching the parietal pattern. In contrast, plants like china rose and tomato have axile placentation, where ovules attach to a central axis formed by the partitioning of the ovary, not along the walls. That’s why they aren’t examples of parietal placentation.

Parietal placentation is when ovules develop on the inner surface of the ovary wall, with placental tissue arising from the walls themselves. This tends to occur in multicarpellate or syncar­pous ovaries where the placentas line the walls rather than forming a central column.

Mustard and Argemone are classic examples because in both, the ovules are borne along the inner surfaces of the ovary walls. The ovary walls themselves provide the placental tissue, matching the parietal pattern.

In contrast, plants like china rose and tomato have axile placentation, where ovules attach to a central axis formed by the partitioning of the ovary, not along the walls. That’s why they aren’t examples of parietal placentation.