ANIMAL KINGDOM Part-4, NCERT Class-11

-
Coelom

Def.- Coelom is a cavity present between body wall and gut wall. It is lined by mesoderm

     In the basis of presence and type of coelom, animals are classified into 3 types

1) Acoelomates:
The animals in which body cavity is absent os called acoelomate
e.g.Platyhelminthes

2)Pseudocoelomates:
In some animals, body cavity is not lined by mesoderm. Instead, the mesoderm is present as scattered pouches in between ectoderm and endoderm. Such body cavity is called pseudocoelom and such the animals possessing them is called pseudocoelomate
e.g.Aschelminthes 

3)Coelomate:
Animals that possess a body cavity lined by mesoderm are known as coelomate
e.g.Annelids to Chordates

Types of animal on the basis of coelom structure
a)Coelomate
b)Pseudocoelomate
c)Acoelomate

Comments

Post a Comment

Popular posts from this blog

DIGESTION AND ABSORPTION PART-1: ANATOMY OF DIGESTIVE SYSTEM

-
Image
         In this post, we are going to discuss the anatomy of Digestive systems on brief accounts.           Food is one of the basic requirements of all living organisms which provides us with energy and organic materials in order to survive. The major components of our food are carbohydrates, proteins and fats. Vitamins and minerals are also required in small quantities. The water we take in, plays an important role in metabolic processes and also prevents dehydration of the body. Biomacromolecules in food cannot be utilised by our body in their original form. They have to be broken down and converted into simple substances in the digestive system. This process of conversion of complex food substances to simple absorbable forms is called digestion and is carried out by our digestive system by mechanical and biochemical methods. Components of Digestive system :           Our digestive system is consists of mainly two parts named - i) Alimentary Canal                   ii) Associated
Read more

ANATOMY OF FLOWERING PLANTS PART-2: PLANT TISSUE SYSTEM AND ANATOMY OF DICOTYLEDONOUS AND MONOCOTYLEDONOUS PLANTS

-
In this post we are going to discuss the Plant Tissue System and Anatomy of Monocot and Dicot System. For the post of Plant Tissue, Click  here . Tissue   System  : •Tissues vary depending on their location in the plant body.  •Tissue structure and function would also be dependent on location.  •On the basis of their structure and location, there are three types of tissue systems. These are the epidermal tissue system , the ground or fundamental tissue system  and the vascular or conducting tissue system . Epidermal   Tissue   System  : •The epidermal tissue system forms the outer-most covering of the whole plant body and comprises epidermal cells, stomata and the epidermal appendages – the trichomes and hairs.  •The epidermis is the outermost layer of the primary plant body.  •Epidermis is made up of elongated, compactly arranged cells, which form a continuous layer.  •Epidermis is usually single ￾layered.  •Epidermal cells are parenchymatous with a small amount of cytoplasm lining th
Read more

ANIMAL KINGDOM Part-2, NCERT Class-11

-
Image
Symmetry • Asymmetrical: Any plane that passes through the center doesn't divide the following organism into two equal half e.g. sponges • Radial Symmetry: Any plane that passes through the central axis of the body divides the following organism into two equal halves e.g.   Coelenterates , Ctenophores, Adult Echinoderms      Radial Symmetry( Hydra sp. ) • Bilateral Symmetry: The body of the following organism can be divided into two equal halves if and only if the cutting plane pass through in a particular way through central axis e.g. Annelids , Arthropods etc. Bilateral Symmetry( Brachyura sp.) Click  Here  for part 1 of this chapter
Read more