What is meant by speciation ? List four factors that could lead to speciation . Which of these cannot be a major factor in the speciation of a self-pollinating plant species. Give reason to justify your answer.

Explanation

### Step-by-Step Solution

1. **Definition of Speciation**:
Speciation refers to the process through which new species arise from pre-existing species. This occurs when populations of a species become isolated from each other and evolve independently, leading to the development of distinct characteristics.

2. **Factors Leading to Speciation**:
Four major factors that can lead to speciation are:
- **Genetic Drift**: This is a random process that can cause allele frequencies to change over time, particularly in small populations, leading to the emergence of new species.
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