What is the type of placentation in which ovules are borne on central axis without septa

Options

A. Parietal, e.g. Primrose
B. Axile, e.g. China rose
C. Free central, e.g. Dianthus
D. Marginal, e.g. Pea

Answer

**Step-by-Step Solution:**

1. **Understanding Placentation**: Placentation refers to the arrangement of ovules within the ovary of a flower. It is an important aspect of the morphology of flowering plants.

2. **Identifying the Structure of the Carpel**: The carpel, which is the female reproductive part of the flower, consists of three main parts: the stigma (the receptive surface for pollen), the style (the elongated tube), and the ovary (the enlarged basal part).

3. **Defining Septa**: Septa are cross walls that divide the ovary into separate chambers or locules. The question specifies a type of placentation where ovules are borne on a central axis without any septa.

4. **Analyzing Types of Placentation**:
- **Parietal Placentation**: Ovules are attached to the inner walls of the ovary, not on a central axis. This is not the correct answer.
- **Axile Placentation**: Ovules are arranged on a central axis but within a multilocular ovary, meaning there are septa present. This does not meet the criteria of having no septa.
- **Free Central Placentation**: This type allows ovules to be borne on a central axis without any septa, fitting the description given in the question.

5. **Conclusion**: The correct type of placentation where ovules are borne on a central axis without septa is **Free Central Placentation**.

**Final Answer**: Free Central Placentation.

---