Basal placentation is found in

Options

A. Silene
B. Dianthus
C. Pea
D. Sunflower

Answer

### Step-by-Step Solution:

1. **Understanding Basal Placentation**:
- Basal placentation refers to a type of ovule arrangement in which the ovules are attached at the base of the ovary. This is a crucial point to identify the plants that exhibit this type of placentation.

2. **Analyzing the Options**:
- We need to evaluate different plants to see which one exhibits basal placentation. The plants mentioned in the transcript include Silene, Dianthus, Pea, and Sunflower.

3. **Evaluating Silene**:
- Silene is described as having three carpels arranged in a syncarpous manner. It has both free central and axile placentation. Therefore, Silene does not exhibit basal placentation.

4. **Evaluating Dianthus**:
- Dianthus is also mentioned as having 2 to 5 carpels arranged in a syncarpous manner with a superior ovary. It has free central placentation, which means it does not have basal placentation either.

5. **Evaluating Pea (Pisum)**:
- Pea plants exhibit marginal placentation, where ovules are arranged along the margins of the ovary. This confirms that Pea does not have basal placentation.

6. **Evaluating Sunflower (Helianthus)**:
- Sunflower is noted to have basal placentation, where a single ovule is attached at the base of the ovary. This confirms that Sunflower is the plant with basal placentation.

7. **Conclusion**:
- Based on the evaluations, the correct answer to the question "Basal placentation is found in" is **Sunflower**.