Animal Kingdom Class 11 Notes Biology Chapter 4 - CBSE

Chapter : 4

What Are Animal Kingdom ?

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    Classification Of Animals

    (On the basis of Organisation, Symmetry, Coelom development)

    • Kingdom
    • Level of Organisation
    • Symmetry
    • Body Cavity or Coelom
    • Phylum

    Animals (Multicellular)

    • Cellular level
      • Mostly Asymmetrical
        • Acoelomata
          • Porifera
    • Tissue/Organ/ Organ system
      • Radial
        • Acoelomata
          • Coelenterata (Cnidaria)
          • Ctenophora
      • Bilateral
        • Without body cavity
          (acoelomates)
          • Platyhelminthes
        • With false coelom
          (pseudocoelomates)
          • Aschelminthes
        • With true coelom
          (coelomates)
          • Annelida
          • Arthropoda
          • Mollusca
          • Echinodermata
          • Hemichordate
          • Chordata

    Classification Of Animals

    Vertebrates (With Backbone)

    • Warm-blooded
      • Bird
      • Mammals
    • Cold-blooded
      • Fish
      • Reptiles
      • Amphibians

    Invertebrates (Without Backbone)

    • Porifera
    • Platyhelminthes
    • Cnidaria
    • Arthopoda
      • Crustacea
      • Arachnida
      • Insects
      • Myriapoda
    • Annelida
    • Echinodermata
    • Mollusca

    Salient Features of Different Phyla in the Animal Kingdom

    Phylum Level of Organisation Symmetry Coelom Segmentation Digestive System Circulatory System Respiratory System
    Porifera Cellular Various Absent Absent Absent Absent Absent
    Coelenterata (Cnidarta) Tissue Radial Absent Absent Incomplete Absent Absent
    Platyhelminthes Organ and Organ System Bilateral Absent Absent Incomplete Absent Absent
    Aschelminthes Organ System Bilateral Pseudocoelomate Absent Complete Absent Absent
    Annelida Organ System Bilateral Coelomate Present Complete Present Absent
    Arthopoda Organ System Bilateral Coelomate Present Complete Present Present
    Mollusca Organ System Bilateral Coelomate Absent Complete Present Present
    Echinodermata Organ System Radial Coelomate Absent Complete Present Present
    Hemichordata Organ System Bilateral Coelomate Absent Complete Present Present
    Chordata Organ System Bilateral Coelomate Present Complete Present Present

    Phylum Chordata

    • Subphyla
      • Urochordata (or) Tunicata
        E.g., Ascida
        • Protochordata
    • Cephalochordate
      • Eg. Branchinostoma
        • Protochordata
    • Exclusively marine
    • In Urochordates, notochord present only in larval tail
    • In cephalochordates, it is present from head to tail and persists life long.

    Vertebrata

    • Possess notochord only in embryonic stages.
    • Notochord replaced by cartilaginous or bony vertebral column.
    • Have ventral heart with 2, 3, or 4 chambers, kidneys for excretion,
    • Have paired appendages (fins or limbs).