Pollination basically refers to the transfer of pollen from the anther to the stigma . Pollination is of many types. The types. of pollination depend on

Options

A. Shape of pollen grain
B. size of pollen grain
C. source of pollen grain
D. size of flower

Answer

### Step-by-Step Solution:

1. **Definition of Pollination**:
Pollination is defined as the transfer of pollen grains from the anther (the male reproductive part of a flower) to the stigma (the female reproductive part of a flower).

2. **Types of Pollination**:
Pollination can be categorized into various types based on different factors. The primary types include:
- **Self-pollination**: Pollen from the same flower or plant fertilizes the ovule.
- **Cross-pollination**: Pollen from one flower fertilizes the ovule of another flower.

3. **Factors Influencing Types of Pollination**:
The types of pollination depend on several factors:
- **Shape of Pollen Grains**: Pollen grains can have different shapes (round, oval, etc.), which may influence how they are transferred.
- **Size of Pollen Grains**: The size can vary (small or large), but this does not affect their function in pollination.
- **Source of Pollination**: This refers to the medium through which pollen is transferred. Common pollinating agents include:
- **Wind**: Wind-pollinated plants release large amounts of lightweight pollen.
- **Water**: Some aquatic plants use water for pollination.
- **Animals**: Insects, birds, and other animals can act as pollinators, transferring pollen as they feed on nectar.

4. **Conclusion**:
The types of pollination depend primarily on the source of pollen transfer, which can vary based on the pollinating agents involved. The size and shape of pollen grains may vary, but they do not significantly influence the type of pollination.