Self-pollination

   Cross-pollination

1. It is transference of pollen grains from anther to the stigma of the same flower.

2. Self-pollination always occurs through touch or wind.

3. Both anthers and stigmas mature simultaneously.

4. It can occur in closed flowers.

5. Race is almost constant i.e., homozygous.

6. It gives rise to pure lines.

7. It preserves the parental characters.

8. It causes inbreeding depression.

1. It is transference of pollen grains from anther to the stigma of another flower of another plant.

2. Cross-pollination always occurs through an external agent.

3. The anthers and stigmas mature at different times.

4. It occurs only when the flowers are open.

5. The race is changing i.e. heterozygous.

6. It gives rise to offspring having variations or hybrids.

7. It does not preserve the parental characters.

8 It  may produce superior quality offspring , there is no inbreeding depression.