| Spermatozoan | Ovum |
| 1. These are formed in males. | 1. These are formed in females. |
| 2. Each has head, neck, middle piece and tail. | 2. It is round in shape. |
| 3. These are produced in million numbers. | 3. These are produced single or two every month. |
| 4. Production of starts only after puberty in males. | 4. Production of ova may start after birth. But ova will be matured in puberty |
| 5. They are motile. | 5. They are non-motile. |
| 6. Life span is 24 - 72 hours. | 6. Life span is 25 hours. |
