Question

Give an example for the following:

a. Roundworm

b. Fish possessing poison sting

c. A limbless reptile/ amphibian

d. An oviparous mammal

Answer 1

a. Roundworm

Aschelminthes are commonly called roundworms as their body appears circular in transverse cross-section.


Final answer: Ascaris.

b. Fish possessing poison sting

Trygon, commonly called sting ray or whip-tailed ray because of the presence of stings in them. By poisonous sting it inflicts wounds on the victim.

Final answer: Trygon (stingray).

c. A limbless reptile/ amphibian

Snakes are limbless reptiles. Tiny vestiges of legs are present in some of the snakes. Amphibians have two pairs of limbs used for locomotion except caecilians (for example, Ichthyophis).

Final answer:
Reptiles: Snakes.
Amphibians: Ichthyophis.

d. An oviparous mammal

Mammals are viviparous in which development of the embryo takes place inside the parent body. Ornithorhynchus (duck-billed platypus) comes under class Mammalia and subclass Prototheria. These are egg-laying mammals (oviparous).

Final answer: Ornithorhynchus.