question_answer 34)

  Find out the false statement (a) Aves are warm blooded, egg laying and have four chambered heart (b) Aves have feather covered body, fore limbs are modified as wing and breathe through lungs (c) Most of the mammals are viviparous (d) Fishes, amphibians and reptiles are oviparous

Answer:

  (a) The characteristics possessed by aves are as follows These are warm-blooded animals having four-chambered heart. Their body is divisible into head, neck, trunk and tail. These are flying animals, having exoskeleton of feathers. They have modified forelimbs into wings and jaws are modified into horny toothless beak. Their bones are light in weight because of air spaces (pneumatic bones) and the body is streamlined to reduce air resistance during flight.       Lungs as well as air sacs are present for double respiration.

Oviparous Animals	Viviparous Animals
Females lay fertilized/unfertilized eggs.	Females give birth to young ones.
The development of zygote takes place  outside the female's body.	The development of zygote takes place inside the female's body.
Females lay number of eggs in a safe place  in the environment but the chances of  survival are less.	Females deliver few young ones and the chances of survival are more.
Examples All birds, most of reptiles and  egg- laying mammals.	Examples Mammals except egg-laying mammals.