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CBSE - IX
The Animal Kingdom
The Animal Kingdom
Animalia classification includes Invertebrata and Vertebrata. Invertebrata classification is characterized by absence of vertebral column. Porifera includes Sycon, Spongilla and Euplectella. Sponges are covered with spongin fibres and has canal system. Coelenterata includes Hydra, Obelia,Corals and Sea anemone and has gastrovascularcavity. Coelenterates are radially symmetrical. Platyhelminthes are acoelomates, triploblastic and bilaterally symmetrical. Tapeworms includes Liver fluke and Planaria. Platyhelmenthes are also called flatworms. Nematoda includes Ascaris, Enterobius and Wuchereria. Filarial worms cause elephantiasis. Annelida includes earthworms and leeches and has true coelom. Arthropoda includes Honey bees, Spiders, Prawns and Centipedes and has open circulatory system. Mollusca includes chiton, mussel, snail and octopus. Echinodermata includes starfish, sea cucumbers and sea urchins and have tube feet for locomotion.
Protochordata has notochord and includes Balanoglossus, Herdemania and Amphioxus. Basis for vertebrata classification are notochord, dorsal nerve cord etc. Classification of vertebrata includes Pisces, Amphibia, Reptilia, Aves and Mammalia Fishes includes cartilaginous and bony fishes. Fish heart is 2 chambered. Salamanders, frogs and toads are tetrapods. Amphibian heart is 3 chambered. Reptiles includes lizards, chameleons, flying lizards, snakes, crocodiles and turtles. Crocodile heart is 4 chamberted. Reptilian heart is 3 chambered. Aves includes birds like sparrows, penguins and eagles. Bird heart is 4 chambered. Modification of fore-limbs in birds into feathers. Mammalia includes platypus,kangaroo,polar bear and dolphin. Mammalian skin maintains body temperature. Mammals have mammary glands. Mammalian heart is 4 chambered.
