Phylum Cnideria Flashcards
general characteristics
radial symmetry specialized cells mesoglea-middle layer true tissues stinging cells respond to touch live in oceans
examples
jellyfish
coral
sea anemone
hydra
digestion
mouth in - Gastrovascular cavity - mouth out
food is caught by tentacles and moved into GVC and digested there
tentacles have cnidocytes (stinging cells) and nematocysts (small harpoon)
respiration
diffusion
circulation
Gastrovascular Cavity
excretion
sac body plan
one opening as mouth and anus
digestive waste expelled thru mouth
nervous system
specialized nerve tissues respond to touch ocelli - eyespot responds to light movement polyp=sessile they have a hydrostatic skeleton which allow them to bend and extract Medusa= motile jet propulsion
asexual reproduction
budding
polyp
sexual reproduction
external fertilization
egg and sperm
jelly fish and hydra are part of what phylum
Cnideria
stinging cells are called
cnidocytes
free swimming and sexual reproduction
medusa
jelly like substance in between the endo and ectoderm
mesoglea
poison filled stinging dart
nematocyst
the GVC is the equivalent to the human
stomach
the sessile and asexually reproducing generation
Polyp
water flow functions in a cnidarian?
circulation
respiration
reproduction
excretion
advantages that cnidaria have over Porifera
radial symmetry ecto and endoderm alternation of generations stinging cells movement
what body plan?
sac body plan
tissue layers
ectoderm and endoderm
symmetry?
radial
