1. In self-pollination, pollen grains are transferred from the anther to the stigma of the same flower whereas, in cross-pollination, pollen grains are transferred from one flower to the stigma of another flower but of the same kind.
2. In self-pollination. both anther and the stigma matures at the same time whereas, in cross-pollination both anther and the stigma matures at a different time.
3. In self - pollination, flowers are genetically same whereas, in cross-pollination flowers are genetically different.
4. Self-pollination causes inbreeding whereas, cross-pollination causes outbreeding.
5. Self-pollination increases decrease genetic variation whereas, cross-pollination increases genetic variation.