Answer:
(a) A viviparous animal
is the one in which development of young ones is direct, later they provides
nutrition to their offspring. It includes all mammals, except Platypus.
(b) A fish
possessing a poison sting is Trygon (sting-ray). It is found on its tail. The
poison released is strong enough to stun an animal.
(c) A fish
possessing an electric organ Torpedo (electric ray). Electric organ in Torpedo
is located in its big round pectoral fin which is just behind the eye. Large Torpedo
can generate a fish killing current of up to 200 volts.
(d) An
organ, which regulates buoyancy is air bladder present in
class-Osteichthyes.(e.g., Exocoetus, Catia).
(e) Animal
exhibiting alteration of generation is Aurelia or jelly fish of
phylum-Cnidaria. Ithas two basic body forms called polyp and medusa are present.
Polyp is sessile and cylindrical whereas medusa is umbrella shaped and free
swimming form. Polyp produces medusa asexually and medusa forms polyps sexually
(e.g., Obelia).
(f)
Oviparous animal with mammary gland is Ornithorhynchus (duck-billed platypes).
Duckbill platypus is the only mammal which lays egg and also bear mammary
gland, which isa characteristic feature of mammals.
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