What is speciation? List four factors that could lead to speciation. Which of these can not be a major factor in the speciation of a self- pollinating plant species? Explain.

Dear Student,
The following factors lead to speciation:
1. Geographical isolation
2. Genetic drift
3. Mutation
4. Natural selection
Geographical isolation cannot be a factor leading to speciation. That is because, self pollinating species do not get affected by Geographical isolation. 

Regards