Simple sieve plate occurs in

Options

A. Cucurbita
B. Vitis
C. pyrus
D. Prunus

Answer

To answer the question "Simple sieve plates occur in," we need to analyze the options provided and understand the characteristics of simple sieve plates.

### Step-by-Step Solution:

1. **Understanding Sieve Plates**:
- Sieve plates are structures found in the phloem of flowering plants. They are involved in the transport of nutrients, particularly sugars.
- Sieve plates can be classified into two types: simple sieve plates and compound sieve plates.

2. **Definition of Simple Sieve Plates**:
- Simple sieve plates consist of a single region of pores. They allow for the flow of sap between sieve tube elements without obstruction.

3. **Identifying the Options**:
- The options given are:
- 1. Cucurbita
- 2. Vitis
- 3. Pyrus
- 4. Prunus

4. **Analyzing Each Option**:
- **Cucurbita**: Known to have simple sieve plates.
- **Vitis**: Contains compound sieve plates, which have multiple regions of pores separated by bars of thickening.
- **Pyrus**: Typically does not have simple sieve plates.
- **Prunus**: Also does not have simple sieve plates.

5. **Conclusion**:
- Based on the analysis, simple sieve plates occur in **Cucurbita**. Therefore, the correct answer is option 1: Cucurbita.

### Final Answer:
Simple sieve plates occur in **Cucurbita**.