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Focus area notes
2020-21
ANIMAL KINGDOM
GHSS
PALLIMON
PART - 1
Symmetry :- Three types :- Asymmetry, Radial symmetry and Bilateral symmetry
(a)
...
Eg: Porifera (Sponges)
(b)
...
Eg: Coelenterates, Ctenophores, Echinoderms
(c)
...
Eg:- Annelids, Arthropods, Vertebrates
Bilateral symmetry
Radial symmetry
Diploblastic body :-Embryonic body wall is made up of two germ layers
...
An undifferentiated layer, mesoglea, is present in between the ectoderm and the endoderm
...
Eg:- coelenterate
...
Outer ectoderm, middle
mesoderm and inner endoderm
...
(a)
...
Triploblastic
Coelom:- It is the body cavity between body wall and gut wall
...
On the basis of
coelom, animals are classified into three
...
Coelomates, 2
...
Acoelomate
(a)
...
[ body cavity is formed in the mesoderm and also lined by mesodermal cells is called eucoelom or true
body cavity)
...
Annelids, Molluscs, Arthropods, Echinoderms, Hemichordates and Chordates
...
Pseudocoelomate :- In some animals the body cavity is not formed in the mesoderm and not lined by
mesoderm, instead, the mesoderm is present as scattered pouches in between the ectoderm and endoderm
...
Eg
...
Acoelomate :- The animals in which the body cavity is absent are called acoelomate animals