Question

Which of the following points are correct?

Oviparous	Viviparous
1. They lay eggs.	1. Give birth to young.
2. Chances of survival of young ones are less.	2. Chances of survival of young ones is more.
3. Eg. Whale and dolphins	3. Eg. Birds and frog

A. 1, 3
B. 2, 3
C. 1, 2
D. All of the above

Answer 1

Hint: Animals show different methods of reproduction and the production of their young ones such as oviparous and viviparous. The main difference between oviparous and viviparous animals is that oviparous animals lay eggs and do not undergo any embryonic development inside the mother. These eggs develop and then hatch into young individuals whereas viviparous animals develop into a young animal inside the mother parent.

Complete answer:
Examples of oviparous animals are Birds, reptiles, amphibians, most fish, insects, mollusks, and arachnids while most mammals are viviparous animals. Young ones of Viviparous animals have more chances of survival because the embryo grows inside the mother's womb, so protection is provided. 1, 2 are the correct distinguishing points between oviparous and viviparous. Oviparous lay eggs and in oviparous animals, chances of survival of young ones are less as the females lay an egg in the open environment which is thus prone to danger by predators. 3 is not correct because whales and dolphins are examples of the viviparous animal while frog and bird are oviparous animals and lay eggs.

Hence, the correct answer is option (C).

Note: Platypus is an exception as belongs to Class Mammalia of subphylum Vertebrata but is oviparous while the rest all are viviparous. Ovoviviparity is a term used for a form of reproduction between egg-laying oviparous and live-bearing viviparous reproduction. These animals have the developing embryos inside eggs while that remains in the mother's body until they are ready to hatch. Examples are sharks, rays, snakes, fishes, and insects.