Multiple choice

Which of these are egg-laying mammals?

  1. Didelphis and Macropus

  2. Tachyglossus and macropus

  3. Zaglossus and Ornithorhyncus

  4. Ornithorhyncus and Didelphis

  5. Tachyglossus and Didelphis.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Correct answer. Both of them are prototherians and are egg-laying mammals. Mammals are in general viviparous, i.e., give direct birth to their young ones but there is one sub-class prototheria in which the mammals lay eggs, i.e., oviparous. These are most primitive mammals confined to Australia. Tachyglossus, Zaglossus, Ornithorhyncus are main examples of this sub-class.

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