Internal fertilization is seen in the animals that undergo the process of fusion of gametes occurs inside the body of the female. External fertilization is seen in animals, and the process of fusion of gametes occurs outside the body of the female. Viviparous organisms are the organisms that undergo the process of fertilization and growth within their body. Such organisms do not lay eggs, rather the complete development takes place inside the female body, and the final baby is delivered at the time of parturition. Example- Dogs, cats, dolphins. Oviparous animals are the animals that lay their eggs in the outside environment, and their eggs are covered with thick calcium shell to keep them protected from the harsh outer conditions. Such animals do fertilization inside the body to avoid the sperm’s penetration through these thick shells of the egg. Examples- Reptiles, birds, molluscs, insects. Ovoviviparous- ovoviviparous includes animals that undergo fertilization and the process of egg hatching within the body of the female. The newborns are given birth only after they are fully hatched. The growing baby gets the nutrients from the yolk of the eggâ€”example- sharks, snakes. Internal fertilization has a certain kind of benefit. The list of these advantages is-
Less wastage of the gametes as the fertilization happens within the body, so there are minimal chances of wasting the gametophytes.
Greater probability and chances of fertilization since the fertilization occurs inside the body itself and hence there are more chances of a successful fusion of the gametes.
In the case of egg formation, there is more protection inside the body as compared to outside.
Selective fertilization takes place in such cases as the sperms enter the body of a single female at a time. So multiple fertilization can be avoided along with the minimal wastage of sperms.
Certain females have the capacity to store for a longer period of time and can undergo fertilization at the time they desire. Advantages of external fertilization:- Less interaction is required between the two, in which interns require less amount of fluids and hormones for the process of fertilization, less risk of transfer of diseases, and greater extent of genetic variation.
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