Question

Name two Oviparous mammals?
(A) Whale, Echidna
(B) Platypus, Echidna
(C) Platypus, Whale
(D) Bat, Echidna

Answer 1

Hint: Egg-laying animals are called oviparous and animals that give birth to their young ones are called viviparous animals. Most of the mammals are viviparous in nature but there are some exceptions also.

Complete answer:
On the basis of zygote development animals are classified as oviparous and viviparous.
> Oviparous animals- The animals which lay eggs are called oviparous animals. In oviparous animals, development of zygotes takes place outside the body of the female.
In oviparous animals, eggs are produced in an amount, this is an adaptation for increasing their chances of survival.
In reptiles, the temperature of the egg is important at some stage in embryonic development as it determines the sex of the offspring.
In oviparous animals eggs are protected by hard calcareous shell covering.
Example of oviparous animals-most amphibians, reptiles fishes are oviparous in nature. Some invertebrates are also oviparous in nature for example insects are oviparous in nature.
> Viviparous animals- Viviparous animals do not lay eggs instead they give rise to their young ones. In viviparous animals development of zygote takes place inside the body of the female.
In viviparous animals, internal fertilization occurs.
Most mammals are viviparous in nature.
Platypus (Ornithorhynchus) and Echidna (Tachyglossidae) are oviparous mammals.
Whales and bats are viviparous animals.

So the correct option is B platypus and Echidna.

Note: In oviparous animals, internal fertilization occurs but development takes place outside the body.
Chances of survival is more in oviparous animals due to greater embryonic care and protection provided by the body of females.
Viviparous animals are present in all corporations of vertebrates besides birds. Fish, amphibians, reptiles, and mammals all have individuals that are viviparous even though not one of the organizations is solely viviparous.