Biology – Animalia Kingdom – General Science Notes – For W.B.C.S Examination.

জীববিজ্ঞান – অ্যানিমালিয়া কিংডম – সাধারণ বিজ্ঞান নোট – WBCS পরীক্ষার জন্য।

Introduction

  • The organisms, which are eukaryotic, multicellular, and heterotrophic, are categorized as Animalia kingdom.Continure Reading Biology – Animalia Kingdom – General Science Notes – For W.B.C.S Examination.
  • The organisms of Animalia kingdom have no cell-wall.
  • Most of animals of Animalia kingdom are mobile.

Classification of Animalia Kingdom

  • Based on the extent and type of the body design differentiation, Animalia kingdom classified as −
    • Porifera
    • Coelenterata
    • Platyhelminthes
    • Nematoda
    • Annelida
    • Arthropoda
    • Mollusca
    • Echinodermata
    • Protochordata
    • Vertebrata
      • Pisces
      • Amphibia
      • Reptilia
      • Aves
      • Mammalia
  • Let’s discuss each of them in brief −

Porifera

  • The literal meaning of ‘porifera’ is the organisms with holes.
  • The organisms of porifera are non-motile and attached to some solid support.
  • The examples of this group are Sycon, Spongilla, Euplectelia, etc.

Coelenterata

  • Organisms of coelenterata group live in water.
  • The organisms of this group have cavity in their bodies.
  • Hydra and sea anemone are the common example of coelenterate.

Platyhelminthes

  • The organisms of this group do not have true internal body cavity or coelom; so, they neither have well-developed organs.
  • The bodies of organisms of this group are flattened from top to bottom; therefore, they are also known as flatworms.
  • Planareia, liverfluke, tape worm, etc., are the typical examples of this group.

Nematoda

  • The organisms of nematode have cylindrical body.
  • The organisms have tissue, but as such no well-developed body (i.e. no real organ).
  • The filarial worms (causing elephantiasis disease), roundworm in the intestines, etc., are the common examples of nematodes.

Annelida

  • The organisms of annelida group live almost everywhere including fresh water, marine water as well as on land.
  • Earthworms, nereis, and leeches are the familiar examples of annelida.

Arthropoda

  • Arthropoda, probably, is the largest group of animals.
  • The animals of this group don’t have well defined blood vessels rather there is an open circulatory system.
  • The literal meaning of arthropod is jointed legs; so, they have jointed legs.
  • Prawns, butterflies, houseflies, spiders, scorpions, etc. are the typical examples of arthropod.

Mollusca

  • The organisms of mollusca are invertebrate.
  • Most of the organisms of Mollusca group live in water.
  • Snails and mussels are the typical example of Mollusca.

Echinodermata

  • The organisms of Echinodermata have spiny skinned.
  • Echinodermata are free-living marine organisms.
  • The examples of echinodermata are starfish, sea urchins, feather star, etc.

Protochordata

  • The organisms of protochordata are normally marine. E.g. Balanoglossus, Herdemania, and Amphioxus
  • The organisms of protochordata show a typical feature of body design, called as notochord; however, it does present there throughout the life.

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