Pollination can be divided into three types.

Options

A. It depends on the source of pollen
B. It depends on the type of pollen
C. It depends on the agency of pollination
D. It depends on environmental conditions

Answer

**Step-by-Step Solution:**

1. **Understanding Pollination**: Pollination is defined as the transfer of pollen grains from the anther (the male part of the flower) to the stigma (the female part of the flower). This process is crucial for fertilization in flowering plants.

2. **Types of Pollination**: Pollination can be classified into three main types based on the source of the pollen. These types are:
- **Autogamy (Self-pollination)**: This occurs when pollen grains are transferred from the anther to the stigma of the same flower. In this case, the plant fertilizes itself.
- **Geitonogamy (Same plant cross-pollination)**: This type involves the transfer of pollen from the anther of one flower to the stigma of another flower on the same plant. Although it involves two flowers, it is still considered self-fertilization since both flowers belong to the same individual.
- **Xenogamy (Cross-pollination)**: This is the transfer of pollen from the anther of one plant to the stigma of a different plant. This type of pollination promotes genetic diversity as it involves two different individuals.

3. **Conclusion**: Therefore, pollination can be divided into three types based on the source of pollen: autogamy, geitonogamy, and xenogamy.