Free-central placentation is found in

Options

A. Dianthus
B. Argemone
C. Brassica
D. Citrus

Answer

### Step-by-Step Text Solution:

1. **Understanding Free-Central Placentation**:
- Free-central placentation is a type of ovule arrangement in which the ovules are attached to a central column of tissue within the ovary, rather than being attached to the walls of the ovary.

2. **Identifying Characteristics**:
- In free-central placentation, the ovules are located in the center of the ovary and are not attached to the sides. This arrangement allows the ovules to be freely suspended in the ovary.

3. **Examples of Plants with Free-Central Placentation**:
- Two well-known examples of plants that exhibit free-central placentation are **Dianthus** and **Primrose**. These plants have their ovules arranged in the central part of the ovary.

4. **Analyzing Other Options**:
- When considering other types of placentation:
- **Argemone** has parietal placentation, where ovules are attached to the walls of the ovary.
- **Brassica (Mustard)** also exhibits parietal placentation.
- **Citrus** fruits show axile placentation, where ovules are arranged along the central axis of the ovary.

5. **Conclusion**:
- Based on the above information, the correct answer to the question "Free-central placentation is found in" is **Dianthus**.