Which of the following is not a post pollination development?

Options

A. A Formation of callose plugs in pollen tube
B. Division of pollen cell into tube cell and generative cel.
C. Secretion of pectinase and other hydrolytic enzyme.
D. Swelling of tube cell and formation of pollen tube.

Answer

To solve the question "Which of the following is not a post pollination development?", we need to understand the concept of post pollination development and analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Post Pollination Development**:
- Post pollination development refers to the processes that occur after the pollen grain lands on the stigma of a flower and begins to grow. This includes the formation of the pollen tube and the fertilization process.

2. **Analyzing the Options**:
- We need to evaluate each option to determine whether it describes a process that occurs after pollination.

3. **Option 1: Formation of Callose Plug in the Pollen Tube**:
- This process occurs after pollination when the pollen tube is growing. It helps in the structural integrity of the tube. **This is a post pollination development.**

4. **Option 2: Pollen Tube Divides into Tube Cells and Generative Cell**:
- This division occurs before pollination, as the pollen grain develops into a two-cell or three-cell stage. **This is NOT a post pollination development.**

5. **Option 3: Secretion of Pectinase and Other Hydrolytic Enzymes**:
- This occurs after pollination to help the pollen tube penetrate the stigma and style. **This is a post pollination development.**

6. **Option 4: Swelling of the Tube Cell and Formation of a Pollen Tube**:
- This process occurs after pollination as the pollen tube grows towards the ovule. **This is a post pollination development.**

7. **Conclusion**:
- Based on the analysis, the only option that does not describe a post pollination development is **Option 2: Pollen Tube Divides into Tube Cells and Generative Cell**.

### Final Answer:
**Option 2** is the correct answer as it is not a post pollination development.