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  • Body having meshwork of cells, internal cavities lined with food filtering flagellated cells and indirect development are the characteristics of phylum:  <st

Body having meshwork of cells, internal cavities lined with food filtering flagellated cells and indirect development are the characteristics of phylum:
 

Option: 1

Porifera
 


Option: 2

Mollusca
 


Option: 3

Protozoa
 


Option: 4

Coelenterata
 


Answers (1)

best_answer

 

 

Phylum Porifera and Morphological Features of Porifera -

  • Phylum Porifera contains the simplest invertebrate animals. 
  • They are commonly called as ‘sponges’.
  • They possess cellular level of organization. Different cells perform the essential functions of ingestion, digestion, excretion, reproduction etc.
  • They are sessile, that is, they remain fixed at a place. The larvae are capable of swimming.
  • They are filter-feeders.
  • Water current allows their nutrition, circulation and excretion.
  • They possess a characteristic water canal system

 

 

 

The name ‘Porifera’ signifies the body made up of pores. Most of the sponges are asymmetric cylindrical in shape with a large central cavity called the spongocoel. There are numerous pores in the body wall called the ostia (sing. ostium) through which water moves in the spongocoel. Water leaves the spongocoel through a large pore called osculum.

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