Question

 In which one of the following the genus name, its two characters and its class/phylum are correctly matched? [CBSE AIPMT 2011]

Answer/Explanation

Ans. (a)
Salamandra (salamander) is a member of class-Amphibia. It has a tympanum representing the ear and fertilisation is external.

Question

The presence of gills in the tadpole of frog indicates that [CBSE AIPMT 2004]

(a) fishes were amphibious in the past

(b) fishes evolved from frog like ancestors

(c) frogs will have gills in future

(d) frogs evolved from gilled ancestors

Answer/Explanation

Ans. (d)
According to biogenetic law of Ernst Haeckel (1860) Ontogeny repeats Phylogeny. Ontogeny is the life history of an organism, while phylogeny is the evolutionary history of the race of that organism. In other words we can say’an organism repeats its ancestral history during its development’. Hence, resemblance of Amphibia to fish is seen in most systems of the body, both are cold-blooded, both respire by gills (as tadpole of frog), both usually lay eggs in water leading to the conclusion that amphibians have originated from fishes.

Question

 Mucus helps frog in forming [CBSE AIPMT 1993]

(a) thick skin

(b) dry skin

(c) smooth skin

(d) moist skin

Answer/Explanation

Ans. (d)

Mucus helps frog in keeping the skin moist that helps in cutaneous respiration when the frog is in hibernation or estivation.

Question

Bull frog of India is [CBSE AIPMT 1992]

(a) Rana tigrina

(b) R. sylvatica

(c) R. ecutesbeiana

(d) R. esculenta

Answer/Explanation

Ans. (a)
Indian bull frog is Rana tigrina.

Question

Skin is a respiratory organ in [CBSE AIPMT 1990]

(a) lizards

(b) birds

(c) primitive mammals

(d) frog

Answer/Explanation

Ans. (d)

Frog is an amphibian and its skin is well adapted or in other words acts as a secondary respiratory organ when it is in water.

Question

 Which is not a true amphibian animal? [CBSE AIPMT 1988]

(a) Salamander

(b) Toad

(c) Tortoise

(d) Frog

Answer/Explanation

Ans. (c)

Tortoise is a reptile of sub-class-Anapsida and order-Chetomia or Testudinata.

Question

Fire bellied toad is [CBSE AIPMT 1988]

(a) Amphiuma

(b) Bombinator

(c) Necturus

(d) Salamandra

Answer/Explanation

Ans. (b)

Fire bellied toad is Bombinator and this is an Anuran.

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