Phylum - PORIFERA

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 Phylum- porifera 


*  ( paros -  pore , ferre ~TO BEAR)

     * Commonly called as " spongs ". 

   General characters 


1 porifera  are all aquatic, mostly  marine few terrestrial . 

2 The are. Sessile and sedentary & grow like plant.  

3. BODY SHAPE : vase or cylinder like .

4 Symmetry:  Asymmetrical or radial.  

5 The body surface  is perpforted .by numerous pores,  the ostia through which water  entous the body of one or more large opening .the oscula by which the water exist .

6 They consist of outer ectoderm & inner endoderm with an  intermediate layer of ,mesenchyme ; therefore diploblastic 

7 mouth - absent , Digestion ~ intracellular 

8  Excautory & respiration  organs are absent 

9 contractile vacucles. Are present in some fresh water forms .

 10 The sponges are monoecious .  

Monoecious-‐》 present male and female reproductive system in (monoecious )  .

11  The nervous & sinsory cell are probably not differential. 

12 Reproduction occurs by both sexual & asexual methods . 

13 sexual Reproduction buds and gemmules. 

14 sexual Reproduction ~ occurs via ova and sperms. 

15 Regeneration:  The spongs possis a high pour of Regeneration  


                          *Thank-you *


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