Exam 33: An Introduction to Invertebrates

Use the following information to answer the questions below. A farm pond,usually dry during winter,has plenty of water and aquatic pond life during the summer.One summer,Sarah returns to the family farm from university.Observing the pond,she is fascinated by some six-legged organisms that can crawl about on submerged surfaces or,when disturbed,seemingly "jet" through the water.Watching further,she is able to conclude that the "mystery organisms" are ambush predators,and their prey includes everything from insects to small fish and tadpoles. -From this description,one can conclude that the organisms that have caught Sarah's attention are

Use the following graph to answer the questions below. Percent of sea slug respiratory carbon demand provided by indwelling dinoflagellates. -If we assume that carbon is the sole nutrient needed by sea slugs to drive their cellular respiration,then based on the graph,during which season(s)is it least necessary for P.ianthina to act as a chemoheterotroph?

Use the following information to answer the questions below. An elementary school science teacher decided to liven up the classroom with a saltwater aquarium.Knowing that saltwater aquaria can be quite a hassle,the teacher proceeded stepwise.First,the teacher conditioned the water.Next,the teacher decided to stock the tank with various marine invertebrates,including a polychaete,a siliceous sponge,several bivalves,a shrimp,several sea anemones of different types,a colonial hydra,a few coral species,an ectoproct,a sea star,and several herbivorous gastropod varieties.Lastly,she added some vertebrates-a parrotfish and a clownfish.She arranged for daily feedings of copepods and feeder fish. -How many of the following organisms possess bilateral symmetry as adults? 1)sponges 2)molluscs 3)echinoderm 4)sea anemones 5)ectoprocts

How many of the following can be used to distinguish a nematode worm from an annelid worm? 1)type of body cavity 2)number of muscle layers in the body wall 3)presence of segmentation 4)number of embryonic tissue layers 5)shape of worm in cross-sectional view

A terrestrial mollusc without a shell belongs to which clade?

Which of the following describe(s)echinoderms?

Use the following information to answer the questions below. Nudibranchs,a type of predatory sea slug,can have various protuberances (i.e.,extensions)on their dorsal surfaces.Rhinophores are paired structures,located close to the head,which bear many chemoreceptors.Dorsal plummules,usually located posteriorly,perform respiratory gas exchange.Cerata usually cover much of the dorsal surface and contain nematocysts at their tips. -The stingers of honeybees have a function most similar to that of

The crown-of-thorns sea star,Acanthaster planci,preys on the flesh of live coral.At times,these sea stars undergo poorly understood population explosions.What impact should such explosions have on those sea slugs that bear cerata (cerata contain nematocysts)? Population explosions of this sea star should

In a tide pool,a student encounters an organism with a hard outer covering that contains much calcium carbonate,an open circulatory system,and gills.The organism could potentially be a crab,a shrimp,a barnacle,or a bivalve.The presence of which of the following structures would allow for the most certain identification of the organism?

Parasitism is one of the most widespread life strategies ever to evolve.Which of the following is consistent with this finding?

Sponges

Which of the following combinations of phylum and description is incorrect?

Which of the following is a diploblastic phylum of aquatic predators?

What would be the most effective method of reducing the incidence of blood flukes in a human population?

Use the following information to answer the questions below. Nudibranchs,a type of predatory sea slug,can have various protuberances (i.e.,extensions)on their dorsal surfaces.Rhinophores are paired structures,located close to the head,which bear many chemoreceptors.Dorsal plummules,usually located posteriorly,perform respiratory gas exchange.Cerata usually cover much of the dorsal surface and contain nematocysts at their tips. -The feet of certain insects,notably of female butterflies,have a function most similar to that of

A terrestrial animal species is discovered with the following larval characteristics: exoskeleton,system of tubes for gas exchange,and modified segmentation.A knowledgeable zoologist should predict that the adults of this species would also feature

Which human profession is most analogous to the lifestyle of the sea slugs described in this scenario?

In incomplete metamorphosis,the young ________,while in complete metamorphosis,the young ________.

If the teacher wanted to show the students what a lophophore is and how it works,the teacher would point out a feeding

Which of the following is a characteristic of adult echinoderms?