Question

Choose a pair of statements true of Gymnophiona.

1. Skin contains minute dermal scales.
2. Teeth are absent on both jaws.
3. Vertebrates are numerous and amphicoelous.
4. Fertilization is external.

A) II and III
B) II and IV
C) I and II
D) I and III

Answer 1

Gymnophiona is the group of amphibians that includes the legless caecilians and all amphibians extra intently associated with them than to frogs or salamanders (the "stem-caecilians").

Complete Answer:
- To solve this question, we must know about the phylum and class to which Gymnophiona belongs to: Apoda ( additionally known as Gymnophiona or caecilia) - Body is long, slim wormlike without limbs and tail and with minute dermal scales.
- Teeth are present in both jaws.
- Vertebrates are several and amphicoelous (circumstance wherein the significant part of each vertebra (the centrum) is concave on both anterior and posterior).
- Fertilization is internal.
Thus the correct answer is (D) I and III.

Additional Information:
- The participants of Gymnophiona are called caecilians, a call derived from the Latin phrase
caecus, meaning “sightless” or “blind”.
- The majority of this organization of limbless, wormlike amphibians stay underground in humid tropical areas all through the world.
- Because of their relatively hidden existence, caecilians are unfamiliar to the layperson and are not usually considered in discussions about amphibians.

Note: Apoda: Caecilians. An expected 185 species include the caecilians, a collection of amphibians that belong to the order Apoda. They don't have any limbs, even though they developed from a legged vertebrate ancestor. The complete lack of limbs makes them resemble earthworms.