Question

Give dignostic characteristics of class amphibia

Answer 1

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.

Answer 2

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.