Basal placentation examples?

Basal placentation examples?

• A. Mango, Banana
• B. Datura
• C. Sunflower, Marigold
• D. China Rose, Tomato

Answer: (C)

Basal placentation means the ovules are attached at the base of the ovary. In flowers like sunflower and marigold, the ovary is typically inferior and has many ovules clustered at the bottom of the chamber. This bottom, base attachment of the ovules is what characterizes basal placentation, so these two are classic examples. The other plants listed don’t show that base-at-the-ovary pattern. Their ovules are arranged along the central axis or along the inner walls of the ovary (axile or parietal types), not at the base, so they don’t illustrate basal placentation.

Basal placentation means the ovules are attached at the base of the ovary. In flowers like sunflower and marigold, the ovary is typically inferior and has many ovules clustered at the bottom of the chamber. This bottom, base attachment of the ovules is what characterizes basal placentation, so these two are classic examples.

The other plants listed don’t show that base-at-the-ovary pattern. Their ovules are arranged along the central axis or along the inner walls of the ovary (axile or parietal types), not at the base, so they don’t illustrate basal placentation.