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A. Those animals whose ears you can see have hair on their body. These animals give birth to the young ones. B. Those animals that do not have ears on the outside, do not have hair on their body. These animals lay eggs. The correct statements are -

A. Those animals whose ears you can see have hair on their body. These animals give birth to the young ones. B. Those animals that do not have ears on the outside, do not have hair on their body. These animals lay eggs. The correct statements are - Correct Answer Both A and B

Concept:

  • Animals reproduce to give rise to young ones who are genetically similar to them.
  • They can reproduce by either laying eggs or giving birth to young ones.
  • Egg-laying animals can show either direct or indirect development.
  • In indirect development, there is an intermediate stage between the laying of eggs and the reproduction of young ones.
  • Animals that give birth to young ones should be able to maintain a constant internal environment and are called warm-blooded animals.
  • Examples: humans and other mammals
  • On the other hand, cold-blooded animals are not able to maintain a constant environment.

Explanation:

  • The animals which give birth to young ones are called viviparous animals.
  • Viviparous animals have external ears and body hairs
  • Examples: humans, elephants, cows etc
  • Those animals which lay eggs are called oviparous animals.
  • These animals do not have external ears or body hairs.
  • examples: insects, birds etc.

Key Points 

  • Warm-blooded animals have a certain mechanism that helps them maintain a constant internal environment.
  • For example, when it is very cold we shiver to generate body heat.
  • Similarly, body hairs act as an insulator and help to maintain a constant temperature.
  • Sweating in summers is another mechanism to help lose excess heat.

⇒ The correct statements are:

A. Those animals whose ears you can see have hair on their body. These animals give birth to young ones.

B. Those animals that do not have ears on the outside, do not have hair on their body. These animals lay eggs.

Additional Information

Allan's rule: 

  • According to this rule, animals adapted to cold climates have shorter limbs and bodily appendages than animals adapted to warm climates.
  • Thus polar bears have shorter ears as compared to other animals.

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