Question

Which of the following are correct for axolotl larva?
(i) it shows neoteny and paedogenesis
(ii) absence of thyroxine affect metamorphosis
(iii) it is die larva of hemichordata

• A. (i), (ii), (iii)
• B. (i) & (ii)
• C. (ii) & (iii)
• D. (iii)

Answer 1

Answer: (B)

Larva of Ambystoma (tiger salamander) is called axolotl larva. It exhibits the phenomenon of neoteny or paedogenesis. If the food and water are scarce and iodine is lacking in water then the axolotl larva leaves water for land and becomes an adult without metamorphosis. During metamorphosis the gills and tail fin are lost. In the abundant supply of food and water containing iodine compounds, the axolotl larva does not change into an adult but remains in the larval form and becomes sexually mature to start reproduction. This phenomenon is known as neoteny or paedogenesis. Metamorphosis in axolotl is induced by injecting thyroid extract. Axolotl larva is found in the mountain regions of Mexico.