Phylum Porifera (Sponges) General Characteristics.

hylum Porifera are the lowest multicellular animals belonging to the kingdom Animalia.
The word “Porifera” mainly refers to the pore bearers or pore bearing species. Based on the embryological studies, sponges are proved as animals and are classified into a separate Phylum in animals.
The poriferans have a spongy appearance and are therefore called sponges.
Characteristics of Phylum Porifera
Some of the important characteristics of phylum Porifera are mentioned below.
The cells of Poriferans are loosely organized.
They are mostly found in marine water. Only a few are found in freshwater.
They are asymmetrical.
They have no organs in their body.
They depict cellular grade of organization.
The body comprises numerous pores known as Ostia and osculum.
The central cavity is called spongocoel or atrium which opens to the outside through the osculum.
They reproduce asexually by budding, and fragmentation.
The nutrition is holozoic.
They have the power to regenerate the lost parts.
The exchange of respiratory gases and nitrogenous wastes occurs by the process of diffusion.
#sponges

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At 1:20 , the habitat is aquatic and In aquatic there are 1)Marine water 2)Fresh water, e.g. Spongila

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Sir if it has only a cell level organization then how can it be diploblastic? If we consider it as a pseduediploblastic then it will be very well.😊

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Sir assalam alaikum phylum porifera is not diploblastic please check this point thank you

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Porifera is diploblastic because it has two germ layers, ectoderm and endoderm, which has two germ layers, we call it diploblastic.

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What is organization of phylum porifera?

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Cellular level of organization

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porifera have no germ layer

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Assalam u alaikum. Thanking you sir.. Sir some Poriferans also exhibit Radial symmetry e.g. Sycon(scypha),leucosolenia. Am I right?

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There is no germ layer in porifera

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phylum porifera - Porifera means porus surface - Pores are of 2 types - Osteal small and many - Osculer- large and few - Body has two layered surface - Outer layer ->pinecoderm - Inner layer->choenoderm - Pinacoderm has pinacocytes - Choanoderm has choanocytes which are flagellated - Water canal system - Asexual= Budding, Binary fission & Gemmule formation - Sexual ->Amoebide cells - Produces sperm and ovum - Skelton is spicules or spongine - mycospongida without skeleton

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