Book : Zoology
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Posted by: CHELSEA
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Writer CHELSEA

Types of alimentary canal

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Introduction

Complete: In this, mouth and anus or clocal aperture are present. E.g. from Nematodes to Chordates Incomplete: In this, only ore opening i.e. mouth is present. E.g. flatworms

Body layers

Diplobastic: Organisms having two germs layers in the body – outer ectoderm and inner endoderm. E.g. Sponges and Coelentrates Triplobastic: Organisms having three germ layer-ectoderm, mesoderm and endoderm. E.g. flatworms to chordates

Respiratory Organs

Gills in aquatic animlas, tadpoles of amphibians, some mollucs and some echinoderms. Tracheae in terrestrial arthopods. Book lungs in arthopods. Lungs in terrestrial animals. Blood circulations: Open circulatory system: Blood flows through large open spaces. Cloud circulatory system: Blood flows in definite vessels in definite circuit and blood is in direct contact with the cells. E.g. annelids, vertebrates


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