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CBSE Class 9 Answered

Pls explain in detail all phylums of kingdom animalia
Asked by Snehal Ambekar | 07 Mar, 2016, 06:50: PM
answered-by-expert Expert Answer

Hi Snehal,

Kingdom Animalia is divided into:

  • Phylum Invertebrata
  • Phylum Vertebrata

Classification of Phylum Invertebrata

PHYLUM

CHARACTERISTICS

EXAMPLES

Porifera

  • Simplest multicellular animals with perforated bodies.
  • The body consists of a tube.

Sycon, bath

Coelenterata

  • Have a two-layered body wall, which encloses a single cavity in which digestion takes place.
  • There are finger-like projections called tentacles present near the mouth for catching food.

Hydra, jellyfish

Platyhelminthes

 

  • Small, soft, flattened and unsegmented worms.
  • Do not have a body cavity or a coelom.

Liver fluke, tapeworm

Annelida

  • The body is cylindrical and divided into ring-like segments.
  • Have a true body cavity called coelom, present between the body wall and the digestive tube, which is filled with coelomic fluid.

Earthworm, leech

Nemathelminthes

  • The body is long, cylindrical and unsegmented without a body cavity.
  • The nervous system is well-developed and consists of simple nerves.

Hookworm, Ascaris

Arthropoda

  • Have jointed limbs, one pair each on some or on all body segments.
  • Have an exoskeleton made of chitin but lack cilia.

Crayfish, crab

Mollusca

 

  • Have a soft, unsegmented body without appendages but with a hard and calcareous shell to protect the soft body. 

Snail, slug

Echinodermata

 

  • The body may be spherical, cylindrical or star-shaped, hard, unsegmented or non-metameric.
  • Possess a spiny exoskeleton.

Starfish, brittle star

Urochordata

  • Triploblastic animals with a coelom which show bilateral symmetry.
  • The body has three distinct parts—proboscis, collar and trunk.

Balanoglossus, Amphioxus

Classification of Phylum Vertebrata

CLASS

       CHARACTERISTICS

EXAMPLES

Pisces

 

  • Organisms belonging to Class Pisces are fish.
  • They are cold-blooded or poikilothermic animals.

Shark, dogfish

Amphibia

 

  • The body is divisible into a head and trunk. Neck is absent.
  • Have a three-chambered heart with two auricles and one ventricle.
  • They are cold-blooded animals.

Frog, toad

Reptilia

 

  • The body is divisible into head, neck, abdomen and tail.
  • Most of them have a three-chambered heart. Ventricle of the heart is partially divided.

Lizard, snake

Aves

 

  • All birds belong to Class Aves.
  • Warm-blooded or homeothermic animals.
  • Heart is four-chambered.

Pigeon, sparrow

Mammalia

 

  • Warm-blooded animals.
  • Have a four-chambered heart with two auricles and two ventricles.

Cat, dog

Answered by | 07 Mar, 2016, 06:54: PM

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