explain the terms of phylum porifera:
(1) water canal system
(2) choanocytes
(3)types of skeleton sponges
anyone answer fastly asap!!!
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Answers
Explanation:
sponges constitute the phylum porifera and have been defined as sessile metazoans that have water intake and outtake outlet openings connected by chambers lined with choanocytes cells with whip like flagella
body of all sponges is the perforated by large number of apertures through which water enter inside body and flows through a system of criss crossing canals connectively forming the canal system
choanocytes
choanocytes are cells that line the interior of asconoid syconoid and leuconoid body type sponges that contain a central flagellum , or cillium surrounded by a collar or micro villi which are connected by a thin membrane they make up choanoderm a type of cell layer found in sponges
type of skeletal sponges
demospongiae
ninety percent of the worlds sponges are found within the class demosponge which alone contains4,750 species these sponges are assymetrical and size can vary from 3millimetres to over 2meters in lenght . demospongiae can be found in all part of the ocean
Hexactinellida
hexactinellida sponges also known as glass sponges can be found all over the world but are. particularly populous in antartic waters they may form symbiotic relationship with shrimp whi lived inside the sponge central cavity
calcarea
calcarea are the only sponges whose skeleton are made of calcium carbonate the class contains more than 400 species that can be found all over the world but are mostly found in temperature water such as in Indian Ocean at shallow depths less than 1,000 meters.