Book : Zoology
posted by
Posted by: CHELSEA
posted by
Writer CHELSEA

Types of alimentary canal

image about


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


related articles

Phylum Pisces

Phylum Pisces

  • Basics
  • posted Date:2017 Sep, 14

General FeaturesPisces i...

read more
Phylum : Echinodermata

Phylum : Echinodermata

  • Basics
  • posted Date:2017 Sep, 14

CharacteristicsGreek words Ekina-spines & derma-skin 1. They hav...

read more
Animal Cell

Animal Cell

  • Basics
  • posted Date:2017 Sep, 14

IntroductionAll animal cells are multicellular. They are eukaryo...

read more

Subscribe With Us For Daily Reading Lesson Materials