Which type of growth is found in pollen tube :-

Options

A. Lateral growth
B. Apical growth
C. Middle growth
D. No growth

Answer

**Step-by-Step Solution:**

1. **Understanding Pollen Tube Formation**:
- Pollen tubes are formed when pollen grains land on a compatible stigma. This process initiates a reaction that leads to the growth of the pollen tube.

2. **Role of Pollen Tube**:
- The primary function of the pollen tube is to transport sperm cells to the egg cell for fertilization. It travels from the stigma through the style and into the ovule.

3. **Structure of Pollen Grains**:
- Pollen grains consist of two types of cells: a vegetative cell and a generative cell. The vegetative cell contains a tube cell that is responsible for the formation of the pollen tube.

4. **Growth Mechanism**:
- The growth of the pollen tube occurs at its tip, facilitated by the tube cell. The vesicles in the tube cell contribute to the elongation of the pollen tube.

5. **Influence of Calcium Ions**:
- The concentration of calcium ions in the carpel affects the growth rate of the pollen tube. Higher concentrations lead to increased growth.

6. **Type of Growth**:
- The growth that occurs at the tip of the pollen tube is characterized as apical growth. This is similar to how apical growth occurs in stems and roots, where the tip of the tissue divides to allow for elongation.

7. **Conclusion**:
- Based on the above points, the type of growth found in the pollen tube is identified as apical growth.

**Final Answer**: The type of growth found in the pollen tube is apical growth.

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