Needed a Document for phulumporifera?
Scleroblast secretes spicules and spongioblast secrets spongin fibre.
Digestive cavity and mouth is absent.
Nutrition is holozoic.
Digestion is intracellular and occurs in food vacuoles of choanocytcs.
Food particle strained out by collar cell and pass them to amoebocytes.
Food is stored in thesocytes.
Distribution of food from ingestive cell to other is brought by the movable amoeboid cell.
Respiration and Excretion takes place by diffusion of gases through body surface.
Excretory matter is Ammonia.
Sponges do not have nervous system.
Reproduction takes place by means of
(A) Asexual - By Budding - Special cell mass gemmules containing archaeocytes.Endogenous budding of asexual reproduction in sponge is known as Gemmulation.
(B) Sexual - Sponges are hermaphrodite, fertilization internal and cross fertilization (Protogynous condition).