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

জীববিজ্ঞান – মেরূদণ্ডী প্রাণিবর্গ  – সাধারণ বিজ্ঞান নোট- WBCS পরীক্ষা ।

Introduction

The organisms of this kingdom have a true vertebral column and the internal skeleton structure.Continue Reading Biology – Vertebrata – General Science Notes – For W.B.C.S Examination.

Classification of Vertebrata

  • Vertebrates are further classified as −
    • Pisces
    • Amphibia
    • Reptilia
    • Aves
    • Mammalia
  • Let’s discuss each of them in brief −

Pisces

  • The organisms of this group are typically different types of fishes.
  • Fishes can live only in water.
  • The skin fish is covered with scales/plates.
  • Fish use oxygen dissolved in water by using gills
  • The tail of fish helps in their movements.
  • Fishes are cold-blooded organisms and their hearts have only two chambers.
  • Fishes lay eggs.

Amphibia

  • The organisms of amphibia have mucus glands in the skin, and they have three-chambered heart.
  • Amphibian can live in water as well as on land.
  • The organisms of amphibian respire through either gills or lungs.
  • The organisms of amphibia lay eggs.

Reptilia

  • The organisms of this group are cold bolded.
  • The organisms of reptilia lay eggs with tough coverings.

Aves

  • The organisms of Aves group are warm-blooded.
  • The organisms of Aves group lay eggs except a few, such as bat.
  • Most of the Aves have feathers.

Mammalia

  • The organisms of Mammalia group are warm-blooded and they have four-chambered hearts.
  • Mammalia are typically characterized for their mammary glands.
  • Mammary glands produce milk to nourish the young one.
  • Most of the mammals produce live baby; however, a few of mammals, such as, the platypus and the echidna lay eggs.
  • Mammals’ skin has hairs along with sweat and oil glands.

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