Question

Frogs and toads belong to Anura or Salientia whose characteristic feature is

• A. Absence of postanal tail
• B. Distinct tympanum
• C. No trace of external gills and gill slits in adults
• D. All of the above

Answer 1

The correct option is D All of the above

Anura, also called as Salientia, is one of the major extant orders of the class Amphibia. Following are the characteristics of Anura:
1) There are scaleless amphibians without a tail and neck in the adult stage.
2) The body is divisible into head and trunk.
3) Vertebrae are less in number and an elongated urostyle is present.
4) Forelimbs are short while hind limbs are long.
5) The tympanum is present. Well developed eyes with monocular vision, are found.
6) Gills are absent in adult stage but they are present in the larval stage.
7) Fertilization is external.
Therefore, the correct answer is option D.