Question

Mark the incorrect match showing the name of animal; class they belong and their feature:

• A.

  Psittacula

  Aves

  Homeotherms, forelimbs modified into wings, four chambered heart

• B.

  Macropus

  Mammalia

  Homeotherms, presence of hairs, internal fertilisation

• C.

  Chelone

  Amphibia

  Two pairs of limbs, internal fertilisation, oviparous

• D.

  Crocodilus

  Reptilia

  Four chambered heart, internal fertilisation, poikilotherms

Answer 1

The correct option is C

Chelone

Amphibia

Two pairs of limbs, internal fertilisation, oviparous

AVES:
i. The characteristic features of Aves (birds) are the presence of feathers and most of them can fly except flightless birds (e.g., ostrich).
ii. The forelimbs are modified into wings. The hind limbs generally have scales and are modified for walking, swimming or clasping the tree branches.
iii. Heart is completely four chambered. They are warm-blooded (homeotherms) animals, i.e., they are able to maintain a constant body temperature.
v. Examples: Corvus (crow), Columba (pigeon), Psittacula (parrot), Struthio (ostrich), Pavo (peacock), Aptenodytes (penguin), Neophron (vulture).

MAMMALIA:
i. The most unique mammalian characteristicis the presence of milk producing glands (mammary glands) by which the young ones are nourished.
ii. The skin of mammals is unique in possessing hair. External ears or pinnae are present.
iii. Heart is four chambered. They are homothermous.
iv. Sexes are separate and fertilization is internal.They are viviparous with few exceptions and development is direct.
v. Examples: Oviparous- Ornithorhynchus (platypus); Viviparous - Macropus (kangaroo), Pteropus (flying fox), Camelus (camel), Macaca (monkey), Rattus (rat), Canis (dog), Felis (cat), Elephas (elephant), Equus (horse), Delphinus(common dolphin), Balaenoptera (blue whale), Panthera tigris (tiger), Panthera leo (lion).

AMPHIBIA
i. They have two pairs of limbs. Body is divisible into head and trunk. Tail may be present in some.
ii. A tympanum represents the ear. Alimentary canal, urinary and reproductive tracts open into a common chamber called cloaca which opens to the exterior.
iii. The heart is three chambered (two auricles and one ventricle). These are cold-blooded animals.
iv. Fertilisation is external. They are oviparous and development is indirect.
v. Examples: Bufo (toad), Rana (frog), Hyla (tree frog), Salamandra (salamander), Ichthyophis (limbless amphibia).

REPTILIA
i. Heart is usually three-chambered, but four-chambered in crocodiles. ii. Reptiles are poikilotherms.
iii. Fertilisation is internal. They are oviparous and development is direct. iv. Examples: Chelone (turtle), Testudo (tortoise), Chameleon (tree lizard), Calotes (garden lizard), Crocodilus (crocodile), Alligator (alligator), Hemidactylus (wall lizard), Poisonous snakes – Naja (cobra), Bangarus (krait), Vipera (viper).