Ques. 1AIPMT 2000
What is true for mammalia?
- Platypus is oviparous.
- Bats have feathers.
- Elephant is ovoviviparous.
- Diaphragm is absent in them.
Answer
(1) Platypus is oviparous.
Solution
As per NCERT, mammals are viviparous with few exceptions; Ornithorhynchus (Platypus) is an egg-laying mammal.
⇒ Platypus is oviparous — statement (1) is true.
∵ Bats have hair and a wing membrane (patagium), not feathers; the elephant is viviparous; a muscular diaphragm is present in all mammals.
Answer: (1)