Write a short note on porifera...
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Answer:
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◽Answer◽
The characteristics possessed by poriferans are as follows:
• Animals that belong to this phylum are commonly
• Animals that belong to this phylum are commonlycalled sponges.
•These have minimal differentiation and division
These have minimal differentiation and divisioninto tissues.
•These organisms are acoelomate (body cavity absent)
These organisms are acoelomate (body cavity absent)with cellular level of body organisation.
•They are mostly marine, but few species are found in
They are mostly marine, but few species are found infreshwater like Spongilla.
• They may be vase-like, rounded, sac-like or branched.
• They consist of innumerable holes or pores all over the
• They consist of innumerable holes or pores all over thebody which lead to a canal system.
•This system helps in circulation of water throughout the body to bring in
circulation of water throughout the body to bring infood and oxygen.
• Only the young forms or larvae are motile. In adult stage, they attach themselves to submerged solid objects
stage, they attach themselves to submerged solid objectsand become stationary (sessile).
• Their body is covered with a hard outside layer or
• Their body is covered with a hard outside layer orskeleton. e.g. Spongilla (freshwater sponge). Sycon (Scypha), Euplectella (Venus' flower basket), etc.
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Explanation:
porifera
Sponges, the members of the phylum Porifera, are a basal Metazoa clade as a sister of the Diploblasts. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells. Wikipedia
Phylum: Porifera; Grant, 1836
Kingdom: Animalia
Scientific name: Porifera
Rank: Phylum
Higher classification: Parazoa