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