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biology chaper 33
Stack #48242
| Question | Answer |
|---|---|
| describe a sponge | sessile have a poreous body lack true tissues and have choanocytes |
| describe a cindarian | radial symetry they have a gastrovascular cavity and cnidocytes (stinging cells) |
| what is an annelid | a segmented worm |
| describe nematode | nonsegmented psudocoelomate covered by a tough cuticle |
| describe an arthropod | segmented coelmate that has an exoskeleton and jointed apendages |
| wnder which developmental mode would echinoderms and chordates fall | deuterostomes |
| which animal is the only animal that dosent belong to the clade eumetazoa and which clade to they belong to | sponge and it belongs to the clade prorifra |
| what is one of the oldest groups in the eumethazoan clade | phylum cnidaria |
| describe the cnidarians | simple diploblastic radial body plan which consists of a sac with a central digestive compartment known as a gastrovascular cavity with a single opening they are carnivorus using tenticles around the mouth to capture prey and they have cnidocytes |
| what are the four classes contained in the phylum cindaria | hydrozoa (hydra) scyphozoans (jellies) cubozoans (jellies with eyes) and anthozoan (coral and sea anemone) |
| what three classes of flatworms in the phylum platyhelminthes | turbellarian, trematodes, and cestoda they are all flattened dorsaly have a gastrovascular cavity and are acoelomates |
| describe the class tubellarian | nearly all free living commonly called planarians have light sensitive eyespots and centralized nerve nets |
| describe the class crestoda | tapeworms all parasitic they lack a digestive system |
| describe the class trematode | flukes parasitic most alternate between sexual stages inside the host remember the snail |
| what phylum do snails, slugs oysters, clams and octipi belong to | mollusca |
| what are the four major classes of molluscs | ployplacophora (chitons) gastropoda (snails, slugs) bivalva (clams) cephalopods (squid, octipus) |
| describe the phylum annelida | segmented worms they are bilaterial coelomate protostomes segmentation allows a high degree of specialization of body regions |
| what are the three classes of annelida | polyhaeta (bristle worm) oligochaeta (earthworm) hirudinea (leaches) |
| describe the nematode | non-segmented pseudocolemate covered by a tough cuticle that is shed durring growth |
| describe an arthropod | segmented coelomates that have an exosekleton and jointed appendages they have an open circulatory system in which hemolymph is circulated |
| what are the four sub-phyla of the phylum arthropoda | cheliceriformes (horseshoe crab, spiders) myriapoda (centipedes) hexapoda (insects) crustacea (crabs) |
| what is the most likley key to the sucess of insects | flight |
| deuterostome is broken betwen two phylums what are they | echinodermata and chordata |
| describe the echinoderms | water vascular system secondary radial symetry and tube feet |
| what charateristis do chordates and echinoderms share | radial clevage development of the coelom from the archenteron and formation of the anus from the blastopore |
| spongocoel | the central cavity of a sponge |
| osculum | a large opening in the sponge that connects the spongocoel to the enviroment |
| choanocyes | flagelated collar cells which line the interior of the spongocoel the move water and trap food |
| mesohyl | gelatinous region betwen the two layers of cells of a sponge |
| amoebocytes | cells that digest the food taken in and carry nutrients to other cells |
| gastrovascular cavity | central digestive compartment of a cnidarian |
| polyps | cylindrical form that adheres to the substrate by the aboral end and extend their tenticals waiting for prey |
| describe a medusa | flattened free floating form of the polyp |
| what are cniodocytes | specialized cells used by cnidarians for defence and to capture prey |
| what are nematocysts | stinging capsules |
| alimentary canal | digestive tube witha a seperate mouth and anus digestive system of a rotifer |
| what is parthogenesis | a type of reproduction in which females produce offspring from unfertilized eggs |
| what is a radula | strap like rasping organ used by moluscs to scrape up food |
| trochopore | larval stage observed in some invertebrates |
| torsion | developmental process in which the viceral mass rotates up to 180 degrees positioning the animals anus and mantle over its head |
| ammonite | shelled cephalopod |
| cuticle | the tough coat that covers the body of a nematode or the exoskeleton of an arthropod |
| ecdysis | the shedding of the exoskeleton and producing a larger one |
| chelicerae | clawlike feeding apendages which serve as pincers or fangs |
| book lung | stacked plates in an internal chamber where gas eschange is carried out |
| incomplete metamorphosis | process by which some insects mature the young called nymphs have diffrent body proportions and lack wings goes through a series of molts each time looking more like the adult |
| complete metamorphsis | process by which some insects mature the young are in a larval stage and enter a pupal stage where metamorphisis takes place |
| water vascular system | a network of hydrolic canals branching into extensinons called tube feet which function in locomotion, feeding and gas exchange they are unique to echinoderms |
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