Smallest flowering plant/flower is

Options

A. Polyalthia
B. Rafflesia
C. Azadirachta
D. Walffia

Answer

### Step-by-Step Solution

1. **Understanding the Question**: The question asks for the smallest flowering plant or flower. We need to identify which of the given options is the correct answer.

2. **Identifying the Options**: The options provided are:
- Option 1: Polyalthea
- Option 2: Rafflesia
- Option 3: Azolla
- Option 4: Wolffia

3. **Defining Angiosperms**: Angiosperms are flowering plants where ovules and pollen grains are formed in flowers, and seeds are enclosed in fruits. They can vary greatly in size.

4. **Analyzing Each Option**:
- **Polyalthea**: This plant can grow up to 20 meters tall.
- **Rafflesia**: Known for its large flowers, it can reach up to 100 centimeters.
- **Azolla**: This is a small aquatic fern but not the smallest flowering plant.
- **Wolffia**: This is a genus of tiny aquatic plants that are considered the smallest flowering plants in the world, measuring less than 2 millimeters.

5. **Conclusion**: Based on the analysis, Wolffia is the smallest flowering plant and is the correct answer to the question.

6. **Final Answer**: The smallest flowering plant/flower is **Wolffia** (Option 4).