Free­central placentation is found in

Explanation

The correct answer is Dianthus. Dianthus: In Dianthus, also known as carnations, the ovary has a single chamber, and the ovules are borne on a central column that arises from the base of the ovary. This arrangement is known as free-central placentation. The ovules are not attached to the ovary wall, but instead, they are attached to the central column by short stalks. This type of placentation is relatively rare in flowering plants. Argemone: Argemone, commonly known as Mexican prickly poppy, exhibits parietal placentation. In parietal placentation, the ovules are borne on the inner walls of the ovary, which are divided into several compartments or chambers by partitions called septa. The ovules are attached to the septa by short stalks. This type of placentation is more common than free-central placentation. Brassica: Brassica, including cabbage, broccoli, cauliflower, and kale, also exhibits parietal placentation. Similar to Argemone, the ovules in Brassica are borne on the inner walls of the ovary, which are divided into two chambers by a septum. The ovules are attached to the septum by short stalks. Citrus: Citrus fruits, such as oranges, lemons, and grapefruits, have axile placentation. In axile placentation, the ovules are borne on the central axis of the ovary, which is connected to the ovary wall by partitions called septa. The septa divide the ovary into several chambers, and the ovules are attached to the septa by short stalks. Axile placentation is the most common type of placentation in flowering plants.