Question

Oviparous mammals are
A) Kangaroo
B) Duck billed platypus
C) Whale
D) Rabbit

Answer 1

Hint:Oviparous animals are the animals which lay eggs to produce their young ones. The females do not carry the embryo within them. Animals like fishes, birds, amphibians lay eggs.

Complete Answer:
Mammals are the organisms which give birth to the young ones. They carry the embryo within them. The male sperm and female eggs fertilised in the female body. The female carries the embryo till gestation and delivery. Then they feed their babies by the milk produced in the body. This is known as vivipary. All the mammals are strictly adapted to this mode.. The mammal called duck billed platypus being a mammal does not follow this rule.
Duck Billed platypus is an aquatic mammal. It has a duck-like beak. It has padded feet adapted for swimming and lays eggs. It is called a mammal because it feeds its young ones by its milk.
Kangaroo- A Kangaroo is a mammal which gives birth to the young one. It carries its baby in the pouch which is in its body and feeds it. The baby stays in the pouch and completes its gestation.
Whale- Whale is an aquatic marine placental mammal. It gives birth to a young one. They have a mammary gland for nursing the baby.
Rabbit- It is a mammal which gives birth to young one and nurses it with milk.

Thus the correct answer is (B). Oviparous mammal is Duck billed platypus.

Note:Viviparous is opposite to oviparous. The animal gives birth to young ones. The fertilisation is internal. In some cases the mother and baby are internally connected through placenta which provides nutrition to the growing foetus and also helps in exchange of gases and waste.