Chapter 7 Flashcards
They are… For some portion of life cycle and all life cycles include a period of ….. Development
Motile, embryonic
Radial symmetry
Round, equal parts radiate from central point
Bilateral symmetry
Can be divided into left and right halves that are more or less equal
Asymmetrical
No symmetry like sponge
Porifera also known as
The sponges
Sponges movement: all are ….
Sessile meaning non motile and attached to hard substrate
Numerous tiny pores that allow water to pass through sponge are? Which in turn allows them to…. Feed. This water flow is essential for what?
Ostia, filter
Carrying waste away from cells and carry gametes
Characteristics of Porifera: symmetry, mostly?, they have what capabilities
Asymmetry
Marine
Regeneration
Types of cells in sponges , what creates the water current? What do the collars do?
Choanocytes (collar cells) which line interior canals
Flagella
Trap food particles
Structural support of sponges: spongin and spicules
Support protein
Support structure made of silica or calcium carbonate
Modes of reproduction for sponges , most sponges are ?
Asexual budding or sexual where sponge releases sperm to be picked up by nearby sponge
Hermaphroditic (both male and female parts)
Cnidarians also known as
Stinging animals
Cnidarians symmetry?, mostly?, two body forms?, two tissue layers?
Radial because of individual polyps
Marine
Medusa: free floating transported by currents and mouth and tentacles face down
Polyp: sessile, mouth and tentacles up
Epidermis covers body
Gastrodermis lines internal body for digestion
What gives cnidarian so their sting?
Cnidocytes (stinging cells) with nematocysts capsules on tentacles , for protection and feeding
Cnidarian so digestive system is?
Incomplete , sac like with only mouth , 1 way
Reproduction in cnidarians
Sexual: medusa stage with epidermal gonads
Zygotes develop into plan ulna that settle on the ground and forms a colony which produces new medusas
OR
Asexual: polyps by budding
Scyphozoa (a.k.a ?) , phyla?, stage ? , all? , movement? ,
True jellyfish
Medusa only forms polyp in reproductive life
Marine
Rhythmic contractions and can’t fight against prevailing water currents
Powerful stings
Classification of cnidarians: Anthozoa (a.k.a ?) , stage of cnidarian?, corals secrete?, what kind of algae?, all?
Corals, sea whips , sea pansy, anemones Colonial polyps lack medusa stage Calcium carbonate house Symbiotic algae within body tissue = zooxanthallae Marine
Classification of cnidarians: Hydrozoa , what is stage?, hat is unusual species?, both … And ….?
Polyp forms with medusa
Physalia : colony of polyps carried by gas filled float
Freshwater and marine
Cnidarians ctenophores also known as
Comb jellies