Phylum Porifera Flashcards
general characteristics
live in oceans pore bearing sessile multicellular heterotrophic no cell walls specialized cells no tissues
examples
sponges
digestion
Filter feeders: plankton from water
digestive pathways
collar cells (flagella) creates water currents
digests it in cells
amoebocytes transport digested food through sponge
respiration
diffusion
water moves through body
water is expelled through osculum
circulation
no system all transport by water flow
excretion
water exists osculum and carries waste with it
nervous system
No nervous system
can produce toxins to make poisonous
sessile : is attached to ocean floor
sexual reproduction
internal fertilization
asexual reproduction
budding: sponge breaks off and grows a new one
gemmules: tough outer layer that can grow in more favourable conditions
pieces of silica which make up the skeleton of many sponges
spicules
_____ cells are responsible for water flow
collar cells
stage of the sponge life cycle that is motile
larva
a flexible protein which makes up the supporting structure of a sponge
spongin
the opening that water exits a sponge
osculum
adult sponges are
sessile
sponges are in the _____ phylum
Porifera
functions of water flow in a sponge
digestion-filter feeders
respiration- diffusion
excretion-water carries waste out of osculum
reproduction-sperm released into water
why are sponges animals
heterotrophic
need O2
no cell walls
spicules provide
support and protection
body plan
sac body plan
openings to digestive track
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