chapter 35 section 2 Flashcards
polyp
a polyp is a vase shaped cnidarian specialized for sessile existence.
Medusa
bell shaped and specialized for swimming.
medusa and polyp are both
cnidarians
the epidermis is the
outer layer of cnidarians
the gastrodermis is the
inner layer of cnidarians
the mesoglea is
a jelly like material between the epidermis and gastrodermis
the planula is
a ciliated larva. found in some cnidarians
cnidocytes are
specialized cells used for defense and capturing prey.
a nematocyst has
a long filament coiled inside of it
colloblast
secrete sticky substances to blind prey
an apical organ enables a
ctenophore to snese its orientation in the water
cnidarians and ctenophores are more complex than sponges because, unlike sponges, they have
tissues and organs
the structure that coordinates the complex activities of a cnidarian’s body is the
nerve net
an example of a cnidarian in the class hydrozoa is a
Portuguese man of war
coral exist in a symbiotic relationship with
algae
ctenophores move through the water by
beating their cilia
how are nematocysts adapted for capturing prey
they have filaments with sharp tips that can inject poison
list three differences between hydras and most other hydrozoans
hydras exist as polyps
they are not colonial
they live in fresh water
what is the dominant body form in the life cycle of a scyphozoan
medusa
what is the dominant body form in the life cycle of an anthozoan
polyp
describe two examples of symbiosis found among cnidarians
clownfish to anemones
coral to algae
how do coral polyps produce a coral reef
when polyps die, their hardened skeletons remain and build up over time
would you expect to find green hydras in a cave pond that receives little or no light?
no, because it has a symbiotic relationship with algae. Algae needs sunlight for photosynthesis to occur
