Question

In a unilocular ovary with a single ovule, the placentation is:

• A. Axile
• B. Marginal
• C. Basal
• D. Free Central

Answer 1

The correct option is C

Basal

The correct option is C.

Explanation of the correct option:

Option C:

1. The mode of arrangement or distribution of placenta and ovules within the ovary is called placentation.
2. An ovary may have one placenta or more than one placenta.
3. And in basal placentation, there is a single placenta that is present at the base of the ovary.
4. Also, only a single ovule is attached to the ovary.
5. Hence, in basal placentation, the ovary is unilocular.
6. Example: sunflower, marigold.

Explanation of the incorrect option:

Option A:

1. In axile placentation, placentation occurs in the middle of the ovary.
2. The ovary is fused in the axile placentation.
3. Example: petunia, tomato.

Option B:

1. Two rows of vertically arranged ovules are attached to the ventral suture or the fusion of the two edges of the ovarian wall.
2. Example: leguminous plants.

Option D:

1. The ovule is supported around a central pillar that is not connected to the ovarian wall by the septum.
2. Example: primrose, Dianthus.

Final answer:

In a unilocular ovary with a single ovule, the placentation is basal placentation.