Question

Write the general characters of amphibians with some examples. 

Answer 1

• Amphibians are the first vertebrates and tetrapods to live both in aquatic as well as terrestrial habitats. 

They are poikilothermic. 

• Body : divided into head and trunk and most of them have two pairs of limbs; 
• Tail may or may not be present. 
• Skin : smooth or rough, moist, pigmented and glandular. 
• Eyes have eyelids and the tympanum represents the ear. 
• Respiration is by gills, lungs and through the skin. 
• Heart is three chambered. 
• Kidneys are mesonephric. 
• Sexes are separate and fertilization is external. 
• They are oviparous and development is indirect. 
• They show hibernation and aestivation. Eg. Bufo (Toad), Rana (Frog).