The generative cell of a two-celled pollen divides in the pollen tube but not in a three celled. Give reasons.

Explanation

**Step-by-Step Solution:**

1. **Understanding Pollen Development**:
- Pollen grains develop from microspore mother cells through a process called microsporogenesis. This process results in the formation of a tetrad of pollen grains.

2. **Formation of Two-Celled Pollen**:
- Each pollen grain undergoes mitosis to form two types of cells: a vegetative cell and a generative cell. This stage is referred to as the two-celled stage of pollen.

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