Question

Distinguish between the five classes of vertebrates on the basis of characters like habitat, kind of exoskeleton, respiratory organs and other distinct features.

July 21, 2024

Answer

Differences between Pisces, Amphibia, Reptilia, Aves and Mammals are as follows:

Character	Pisces	Amphibia	Reptilia	Aves	Mammals
1. Habitat	Aquatic	Terrestrial and aquatic	Terrestrial	Arboreal	Terrestrial, aquatic and arboreal
2. Exoskeleton	Slimy scales	Absent	Dry and scaly	Feathers, claws	Hair, nails, etc.
3. Respiratory organs	Gills	Gills, lungs and skin	Lungs	Lungs	Lungs
4. Body temperature	Cold-blooded	Cold-blooded	Cold-blooded	Warm-blooded	Warm-blooded
5. Heart	2-chambered	3-chambered	3-chambered	4-chambered	4-chambered
6. Locomotary organs	Fins	Limbs	Limbs; but absent in snakes.	Wings and limbs	Limbs
7. Others	Body is streamlined. They are oviparous.	They have webbed feet. Eggs are laid in water and larvae are aquatic.	They are oviparous and some are viviparous, e.g., lizard and snake. Development is external.	Body is covered by feathers and forelimbs are modified into wings.	Presence of mammary glands. There are hairs on the body and external pinna is also present. They are viviparous.

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