Question

The ovules are attached on the walls of chamber in ______.

• A. superficial placentation
• B. axile placentation
• C. parietal placentation
• D. marginal placentation

Answer 1

The correct option is A superficial placentation

The ovules are attached on ovary walls on one or more cushion called placenta. The manner in which placenta are arranged on ovary wall is known as placentation.

Superficial placentation: This type of placentation occurs in a multicarpellary, multilocular ovary. The ovules are borne on placenta, which develop all-round the inner surface of the partition wall, e.g., Nymphaeaceae.

Axile placentation: The placenta is axial and ovules are attached to it in a multilocular ovary. Example - lemon.

Parietal placentation: Ovules develop on the inner wall of the ovary or on the peripheral. It is single-chambered, but due to the formation of a false septum, it becomes two-chambered. Example - mustard.

Marginal placentation: The placenta forms a ridge along through the ventral suture of the ovary, ovules are borne on the ridge to form two rows. Example - pea.

Hence, the ovules are attached on the walls of chamber in superficial placentation.