Question

Differentiate oviparous and viviparous organisms. Also, give examples.

Answer 1

Oviparous animals: They are egg-laying, fertilization is internal but the development of the embryo is external. Example. Birds.
Viviparous animals: They give birth to offspring. The fertilization and development of the embryo both occurs inside the female body. Example. Cat

Complete answer:

Sr. No.	Oviparous animals	Viviparous animals
1	They lay egg- Fertilized or unfertilized	They give birth to their offspring.
2	Development of embryos occur outside the body.	Development of embryos occur inside the female body.
3	Fertilization is internal or external	Internal fertilization
4	Embryo takes nutrition from yolk sac.	Embryo takes nutrition from the mother by placenta.
5	Low chances of survival, because eggs are in open environment	High chances of survival because the embryo is safe in the mother's womb.
6	Example : Birds, Reptiles, Amphibian, Pisces, Insects etc.	Example: Mammals ( except few) like cats , dogs, humans etc.

Additional information:
Some animals are ovoviviparous. Ovoviviparous animals lay eggs but development of the eggs occurs inside the female body. The eggs are hatched inside the female body. Some examples of ovoviviparous animals are sharks, rays, snakes, fishes, and insects.

Note: Some mammals like Echidna (Tachyglossidae) and Platypus (Ornithorhynchus) are oviparous mammals and insects like aphids, Zootoca vivienda, which is a reptile are viviparous.