Differences between External Fertilization and Internal Fertilization
Depending upon the place of fusion of gametes, fertilization is of two types-external and internal.
External Fertilization:
External Fertilization occurs outside the body of female . eg Frog ,Fishes.
Internal Fertilization:
Internal Fertilization is the one which takes place inside the body of the female e.g Mammals, Birds, Reptiles, Insects, Spiders. For this the male introduces the sperms in the reproductive tract of the females.
| External Fertilization | Internal Fertilization |
| Place. Fertilization occurs outside the body of the female. | Fertilization occurs inside the body of the female. |
| Release of Gametes. Both the sexes discharge their gametes outside their body. | Only the male discharges the gametes and that also in the reproductive tract of the female. The female retains its gametes. |
| Surety. It is not a sure method. | It is a sure method of fertilization. |
| Embryo. Embryo develops unprotected, outside the body of the female. Examples. Fishes, Amphibians. | Embryo is generally well protected but may develop outside or inside the body of the female. Reptiles, Birds, Mammals, Insects, Spiders. |
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