Give the characteristics of Phylum Porifera.

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(A) The members of Phylum $Porifera$ are commonly known as sponges.They are primitive multicellular animals with a cellular level of organization.They

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Cellular level of organization,presence of ostia and osculum.

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(A) The members of Phylum $Porifera$ are commonly known as sponges.They are primitive multicellular animals with a cellular level of organization.They have a water transport or canal system.Water enters through minute pores called $ostia$ in the body wall into a central cavity,$spongocoel$,from where it goes out through the $osculum$.This pathway of water transport is helpful in food gathering,respiratory exchange,and removal of waste.$Choanocytes$ or collar cells line the spongocoel and the canals.Digestion is intracellular.The body is supported by a skeleton made up of $spicules$ or $spongin$ fibers.They are hermaphrodite,i.e.,eggs and sperm are produced by the same individual.

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