Question

Bat is included in which class?
(a) Amphibia
(b) Reptilia
(c) Aves
(d) Mammalia

Answer 1

Hint Bats can fly but they have mammary glands. The milk is secreted through mammary glands on which their young ones feed. Bats are included under the phylum Chordata because of the presence of dorsal notochord during their development.

Complete answer
Class Amphibia includes animals that can live in both terrestrial and aquatic habitats. Amphibians have three chambered hearts and are cold blooded. Indirect development occurs in them. They lay eggs (oviparous). They respire through lungs, gills and moist skin. Frog, tree frog, salamander are some examples of Amphibians.
Class Reptilia includes animals that have creeping or crawling type of locomotion. They usually have a three-chambered heart except crocodiles which have a four-chambered heart. The body of reptiles is covered by dry skin and scales. They are cold blooded animals that mostly live on land. Crocodiles, cobras, and lizards are some examples of Reptiles.
Class Aves includes birds. Their most important feature is the presence of feathers. It includes birds that have four chambered hearts and are warm blooded. Most of the birds can fly except ostrich. Because of the presence of bony endoskeleton and presence of air cavities in long bones, they can fly. Examples include parrot, sparrow etc.
Class mammalia includes animals that have four chambered hearts and are warm blooded. The most important feature of mammals is the presence of mammary glands on which newly born babies feed. They are also unique because of the presence of hair on skin. Most of them are viviparous except Platypus and Echidna. They respire through lungs. Examples include bats, tigers etc.

Thus the answer of the above question is (D) Mammalia because bats are characterized by the unique feature which is present in mammals i.e. presence of mammary glands. They nourish their baby with the help of milk secreted from mammary glands.

Note: The chordates are divided into five classes - Pisces, Amphibia, Reptilia, Aves and Mammalia. Viviparous are animals that can give birth to their young ones while oviparous animals lay eggs. The cold blooded animals are called poikilotherms while warm blooded animals are called homeotherms.