ANIMAL KINGDOM Part-1, NCERT Class-11

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Basis of Classification: Levels of Organisation

*All members of Kingdom Animalia is multicellular

•Cellular Level of Organisation:
  1)Cells are arranged as loose aggregates
 2)Some division of labour occur among the cells
e.g. Sponges

•Tissue Level of Organisation:
1)Cells performing the same function are arranged intotossues
e.g. Coelenterates

•Organ Level of Organisation:
1)Tissues are grouped together to form organs, each specialised for a particular function
e.g. Platyhelminthes

•Organ System Level of Organisation:
1)Organs have associated to form functional systems, each system concerned with specific physiological function 
e.g. Annelids to Chordates



Types in case of Organ System Level of Organisation:

•Incomplete Digestive System: 
    Possess only one single opening outside the body which act as both mouth and anus
e.g. Platyhelminthes

• Complete Digestive System:
   Possess two openings

•Open Type Circulatory System:
   Blood is pumped out of heart and cells and tissues directly bath in it

• Closed Type Circulatory System:
  Blood is curculated through a series of vessels of varying diameters (Arteries, Veins and Capillaries)

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