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However, viviparous reptiles mostly keep soft-shelled eggs inside their bodies, and the embryo exists on the material in the egg. This is ovoviviparus, because of the source of nutrition. There are some amphibians and some reptiles which are genuinely viviparous because the get their nutrition from a placenta or directly from the mother's blood supply.
Viviparous plants produce seeds that germinate before they detach from the parent. In many mangroves, for instance, the seedling germinates and grows under its own energy while still attached to its parent. Then it drops into the water to transport away.
In some trees, like jackfruit, the seeds can be found already germinated while the fruit goes overripe. This condition is not vivipary because the moist and humid conditions just mimics a wet soil. However, the seeds can germinate under soil too.