Question

Which of the following is a mammal?
(a)Psittacula
(b)Manis
(c)Planorbis
(d)Hydrophis

Answer 1

Hint: The animal which nourishes their young with milk secreted by mammary glands belongs to the kingdom-Animalia, phylum-Chordata, family manidae found in south Asia and east Asia Ex: Pangolin. It is the only animal in the world that is covered with keratin scaled from head to toe.

Complete answer:
Manis is a genus of an animal found in South Asia and East Asia called pangolins. These are one of the endangered species belonging to the family manidae. They are homeothermic amniotes and nourish their young with milk secreted by mammary glands which is an important feature of mammals. They have large protective scales made up of keratin covering the skin. Mannis is the only known mammal found with this feature.

Additional Information: 1 Psittacula is the genus name of the parrot which belongs to the kingdom-Animalia, phylum-Chordata, class-AVES. It is not a mammal, it comes under birds.
2.Planorbis is a genus name of freshwater snails belonging to the kingdom-Animalia, phylum-Mollusca.
3.Hydrophis is a genus of sea snakes belongs to the kingdom-Animalia, family-Elapidae, phylum-Chordata
4.In the entire animal kingdom mammals are of the highest class.
5.Mammals are the vertebrate animals that belong to the class Mammalia.
5.Mammals reproduce only by sexual reproduction and they contain mammary glands to feed their offsprings.
6.Mammals contain a four-chambered heart.
7.Balaenoptera musculus(blue whale) is the largest mammal.
So the correct option is ‘manis’.

Note: -Vivipary is shown by all mammals except platypus and echidna.
-All mammals do not have biconcave RBCs, example camels have ovoid RBCs.
-Muscular diaphragm and mammary glands are the only characteristics that are exclusive to mammals without exceptions.