Bioniac

Phylum - Porifera • Commonly known as   sponges. • Generally marine ,  mostly  asymmetrical . • Multicellular, cellular level of organisation. • Primitive animals. • Water Transport System or Canal System  present. • Water enters the body cavity/central cavity through minute small pores named Ostia  and goes out through a big pore named Osculum   • Canal system helps the poriferans in food gathering,   respitory exchange,   waste removal   etc. • The central cavity is known as Spongocoel   which is lined by Choanocytes   or Collar   cells .  • Intracellular   digestion • Body of poriferans are supported by Spicules   or Spongin   fibres . • Hermaphrodite   (sex is not seperate) •  Asexual   reproduction  -   Fragmentation Sexual Reproduction  - Gamete   Formation   • Internal  fertilization • Indirect   development • Possess larval stage that is morph...