Question

give the basis of classification of animilia kingdom?

Answer 1

Hello!

$\boxed{\sf BASIS\: OF \:CLASSIFICATION}$

Though different animals differ in their form and structure, there are some fundamental similarities in them.

These features form the basis for the classification of animals.

I'll describe some of 'em here :-

$\boxed{\sf 1.}$ Organization →

The patterns of organization of cells vary in animals in spite of their multicellular nature.

The patterns of cellular organization seen in animals are:-

( a ) Cellular level of organization -
In these animals, the cells of the body form loose aggregates.

( b ) Tissue level of organization -
In these animals, cells of the animal carrying out the same function are arranged in tissues.

( c ) Organ system level of organization -
In these animals, tissue are grouped together to form organs, each specialized for a particular function.

$\boxed{\sf 2.}$ Body Wall →

The body wall of the animal may be arranged in two or three embryonic layers. Accordingly the animals are called :

( a ) Diploblastic -
Having outer ectoderm and inner endoderm and undifferentiated mesoglea in between them.

( b ) Triploblastic -
Having outer ectoderm, middle mesoderm and inner endoderm.

$\boxed{\sf 3.}$ Coelom →

The presence or absence of a cavity called coelom in between body wall and gut is
important for classification.

The animals are of three types based on the presence or absence of coelom :

( a ) Acoelomates -
In these animals body cavity is absent.

( b ) Pseudocoelomates -
In these animals the body cavity is not lined by mesoderm.

( c ) Eucoelomates-
In these animals true coelom lined by mesoderm is present.

$\boxed{\sf 4.}$ Body Symmetry →

The arrangement of body parts around a central point or line determines symmetry.

( a ) Asymmetrical -
Can't be divided into two equal halves along any plane passing through the centre

( b ) Radial Symmetry -
Can be divided into two equal halves along any plane passing through the central axis.

( c ) Bilateral Symmetry -
Can be divided into identical left and right halves along only one plane.

$\boxed{\sf 5.}$ Notochord →

Notochord is a supporting rod-like structure derived from mesoderm. It may be present
in embryonic or adult stages.

• The animals which possess notochord are called chordates.

• The animals in which notochord is absent are called non-chordates

$\boxed{\sf 6.}$ Segmentation →

It is also called metamerism.
The body is externally and internally divided into repeated, linear series of body units called metameres.

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