Which among the following statements is incorrect about mammals?

Only 1

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Both 1 and 2

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Both 1 and 4

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Only 4

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Solution

The correct option is A Only 1
External ear (pinna) is not present in all mammals. It is absent in egg-laying mammals.
The presence of teeth in the sockets of the jawbone is a characteristic seen in all mammals.
The most advanced mammals are the primates. Primates include monkeys, apes and humans. Primates have a well developed brain and improved vision.
All mammals are not viviparous. The duck-billed platypus is an oviparous mammal or an egg-laying mammal.
In viviparity, eggs are developed inside the reproductive tract of females where the development takes place and young ones are born.

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Similar questions

A few unique features of mammals are listed here. Pick the incorrect one(s).

I. Body is covered with skin and hair which are thermoregulatory in function.

II. All mammals give birth to a fully developed infant after gestation.

III. Feeds the infant with milk from modified sweat glands.

IV. All mammals are not viviparous.

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