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function of body wall of spong?

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Phylum Porifera – Characteristics , Types , Functions & Reproduction

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PHYLUM PORIFERA

The Porifera are sponges. They are primarily marine animals. There are nine thousand species of sponges. There are following characteristics of the phylum Porifera:

Their bodies consist of loosely organized cells.They vary in size from less than a centimeter to a mass that can fill your arm.They are asymmetrical or radially symmetrical.They have three cell types: pinacocytes, mesenchyma cells, and choanocytes.They have central cavity or spongocoel. This cavity may be divided into series of branching chambers. Water circulates through these chambers for feeding.Numerous pores are present in the body wall. i.e. ostia and osculumThey have no tissue or organ.Skeleton is composed of spicules.Nervous system is absent but neurosensory cells are present.Asexual reproduction takes place by budding.
They are hermaphrodites and larvae are produced during development.