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  • Diversity in The Living World
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Animal Kingdom

Animal kingdom comprise of multicellular eukaryotic animals and is one of the kingdoms among five kingdom scheme of classification (by Whittaker).

Basic of classification:

Habitat: The place where an organism lives. On the basis of habitat, animals are divided into – aquatic and terrestrial.

Level of Organistaion: The five levels of organization are – acellular, cellular, tissue, organ and organ system.

Symmetry: Symmetry refers to the similarity in the arrangement of parts on the opposite sides of the body.

Types of symmetry are–

a) Radial symmetry

                             

b) Bilateral symmetry

                      

Germ layers:

Most animals develop from 3 germ layers: Ectoderm, Mesoderm and Endoderm.

                                           

Body cavity:

Flatworms are acoelomates, roundworms are pseudocoelomates. Other animals above nematodes are coelomates.

          

Phylum:

                        

Learn more about various phylum:-

Animals show 3 structural levels:

Cellular level (Porifera), tissue level (Coelenterata), and organ­ system level (Platyhelminthes to Chordata).

Most of the animals are unisexual. Some are bisexual like liverfluke, earthworm.

Digestive tract -is incomplete in Coelenterata to Platyhelminthes, and complete in all other phyla.

Respiration in animals may be body surface (Hydra), bronchial (Prawn), pulmonary, tracheal Insects), or cutaneous (earthworm).

Circulatory system is open in Arthropoda and Mollusca and closed in Annelida and Chordata.

Animals have a variety of excretory organs: Flame cells (liverfluke), intracellular tubules (Roundworms), nephridia (Earthworm), malpighian tubules (Insects), antennary (Crustaceans), kidneys (vertebrates).

Most animals have head, appendages, skeleton and nervous system. 

Broad Classification of Kingdom Animalia:  

                 

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