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Question : 30 of 100
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Class – Amphibia- As the name indicates (Gr., Amphi: dual, bios, life), amphibians can live in aquatic as well as terrestrial habitats.
- Most of them have two pairs of limbs.
- The body is divisible into head and trunk.
- Tail may be present in some.
- The amphibian skin is moist (without scales).
- The eyes have eyelids.
- A tympanum represents the ear.
- Alimentary canal, urinary and reproductive tracts open into a common chamber called cloaca which opens to the exterior.
- Respiration is by gills, lungs, and through the skin.
- The heart is three-chambered (two auricles and one ventricle).
- These are cold-blooded animals.
- Sexes are separate.
- Fertilization is external.
- They are oviparous and development is indirect.
- Examples: Bufo (Toad), Rana (Frog), Hyla (Tree frog), Salamandra (Salamander), Ichthyophis (Limbless amphibia).
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