Current Biodiversity (part 3) Flashcards
3 big groups of cnidaria
jellyfish, anemones, coral
cnidaria have __ symmetry
radial; allows for increased food consumption bc of increased opportunity (can’t see)
diploblastic
2-tissue layers
tissues
group of specialized cells working together to perform a function
germ layers are made up of
tissues
2 forms of cnidaria
medusa (upside down, can move), polyp (tentacles above, sessile)
nerve net
no centralized nervous system; allows for sensory (cells) to perceive chemicals, light, touch (but ONLY upon contact)
coral/anemones have a mutualistic relationship w/…
zooxanthellae (gives color and provides energy by photosynthesis)
what limits coral growth?
zooxanthellae (give 70-90% of nutrients needed for coral)
nematocysts
specialized cells w/ barbed tails that release toxins (jellyfish stings)
nematocysts are used by jellyfish to…
defence, catching prey
jellyfish do better at __ temps
increased
coral bleaching
high temps = zooxanthellae’s photosynthetic mechanisms break down from too much energy = coral “spit” them out = loss of color and can starve coral
mass bleaching events occur when ___% of coral experience belaching
more than 10%
platyhelminths
flatworms
platyhelminths can live in…
terrestrial, marine, and freshwater BUT they require moisture/humidity
platyhelminths have __ symmetry
bilateral
triploblastic
3 tissue layers
platyhelminths are the first example of…
cephalization; low degree but have eye spots and nerve clusters
AND
predators
chemoreceptors
chemical receptors
what limits platyhelminths growth?
they only have 1 opening so they can only eat more after they digest last thing they ate
2 types of parasitic flatworms
flukes worms (infections) and tapeworms (digestive systems)
