Give dignostic characteristics of class amphibia
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Being tetrapods (4 limbs) that facilitate moving about on land - these limbs evolved from the pectoral and pelvic fins.
Skin is thin, soft, glandular and magid (lack scales except in the caecilians) - skin of caecilians with scales similar to those of fish.
Ectothermic.
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Answer :
Amphibia -
- They are aquatic as well as terrestrial.
- They have two pairs of limbs.
- Their body is differentiated into head and trunk.
- Tail may not be present in some of the amphibians.
- Their skin is moist.
- They do not possess scales.
- The eyes have eyelids.
- A tympanum represents ear for the amphibians.
- The alimentary canal, urinary and reproductive tracts open in the common chamber.
- This common chamber is called the cloaca.
- The respiration occurs by gills or lungs and also through skin.
- They have three chambered heart which includes two auricles and one ventricle.
- They are said to be cold blooded animal.
- The sexes are separate.
- The process of fertilization is external.
- The development is indirect.
- They are oviparous organisms.
- Ex : Bufo, Hyla, etc.
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