Exam 33: An Introduction to Invertebrates

Aside from the density of dinoflagellates in P.ianthina skin,how many of the following factors can affect whether or not the endosymbiotic dinoflagellates promote the sea slug's survival (assuming latitudes above or below Earth's equator)? 1)day length 2)height of sun above the horizon 3)cloud cover 4)depth at which P.ianthina lives 5)water clarity

Corals are most closely related to which group?

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 spiracles and tracheae of insects have a function most similar to that of

Use the following graph to answer the questions below. Percent of sea slug respiratory carbon demand provided by indwelling dinoflagellates. -According to the graph,during which season(s)of the year is the relationship between the sea slug and its dinoflagellates closest to being commensal?

How is an arthropod's exoskeleton well adapted for life on land?

If the teacher had wanted to demonstrate that some invertebrates possess a closed circulatory system,the teacher should have removed and dissected a

Planarians lack dedicated respiratory and circulatory systems because

Had the teacher wanted to point out organisms that belong to the most successful animal phylum,the teacher should have chosen the

The bivalves started to die one by one; only the undamaged shells remained.To keep the remaining bivalves alive,the teacher would have to remove the

Which of the following is true of members of the phylum Cnidaria?

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. -One day,little Tommy (a student in an undersupervised class of 40 fifth graders)got the urge to pet Nemo (the clownfish),who was swimming among the waving petals of a pretty underwater "flower" that had a big hole in the midst of the petals.Tommy giggled upon finding that these petals felt sticky.A few hours later,Tommy was in the nurse's office with nausea and cramps.Microscopic examination of his fingers would probably have revealed the presence of