Marginal placentation is seen in which plants?

• A. Sunflower, Marigold
• B. Pea, Bean
• C. China Rose, Tomato
• D. Datura

Answer: (B)

Marginal placentation is the pattern where ovules are attached along the ventral margin of a single ovary, so seeds form along the edge of the fruit. This arrangement is characteristic of legumes, where the ovary often has a single row of ovules along the seam.

Peas and beans are classic examples, as their ovaries carry ovules in a line along the margin, leading to seeds developing along the edge of the pod. That makes them the best fit for marginal placentation among the options.

The other plants listed are associated with different placentation types, such as axile or parietal, where ovules are arranged on a central axis within each locule or along the walls of the ovary, not along a single margin. Hence they do not display marginal placentation.