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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