Question

Parietal placentation is characteristic of

• A. Hibiscus rosa-sinensis
• B. Solanum nigrum
• C. Brassica campestris
• D. Allium cepa

Answer 1

The correct option is C

Brassica campestris

The correct option is option C.

Explanation of Correct option :

1. Placentation is the arrangement of ovules within the ovary.
2. Parietal placentation is an arrangement in which ovules develop on the inner wall of the ovary.
3. An example of parietal placentation is the family Brassicaceae ie., Brassica campestris.

Explanation of incorrect option

Option A:

1. Hibiscus rosa-Sinensis shows axile placentation.
2. In axile placentation, the placenta is axial and ovules are attached to it in a multilocular ovary.

Option B:

1. Solanum nigrum also shows axile placentation.
2. Here the ovules are attached to it in a multilocular ovary.

Option D:

1. Allium cepa also shows axile placentation.
2. There is an axile arrangement around a multilocular ovary.

Final answer: Parietal placentation is the characteristic feature of Brassica campestris.