Exam 33: An Introduction to Invertebrates

Sponges are most accurately described as

The water vascular system of echinoderms

If the teacher had used a dissecting microscope to examine the outer surfaces of the empty bivalve shells,the teacher would probably have seen marks that had been left by

Use the following information to answer the questions below. This nudibranch,a type of sea slug,has many reddish cerata on its dorsal surface,as well as two,white-tipped rhinophores located on the head. The nontaxonomic term sea slug encompasses a wide variety of marine gastropods.One feature they share as adults is the lack of a shell.We might think,therefore,that they represent defenceless morsels for predators.In fact,sea slugs have multiple defences.Some sea slugs prey on sponges and concentrate sponge toxins in their tissues.Others feed on cnidarians,digesting everything except the nematocysts,which they then transfer to their own skins.Whereas the most brightly coloured sea slugs are often highly toxic,others are nontoxic and mimic the colouration of the toxic species.Their colours are mostly derived from pigments in their prey.There are also sea slugs that use their colouration to blend into their environments. -Sea slugs can obtain nematocysts by preying on sea

In the lab,you are comparing several insect species that undergo metamorphosis.In incomplete metamorphosis,the juveniles look like small adults,while in complete metamorphosis,the different larval stages look completely different from the adults.Both types of insect groups are successful and well-adapted to their environments. -Can you think of a potential advantage of complete metamorphosis?

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 parapodia of polychaetes have a function most similar to that of

A brachiopod can be distinguished from a bivalve by the presence of

The larvae of many common tapeworm species that infect humans are usually found

One should expect to find cilia associated with the feeding apparatus of

If the pond organisms are larvae,rather than adults,Sarah should expect them to have all of the following structures except

The sharp,inch-long thorns of the crown-of-thorns sea star are its spines.These spines,unlike those of most other sea stars,contain a potent toxin.If it were discovered that crown-of-thorns sea stars do not make this toxin themselves,then the most likely alternative would be that this toxin is

If a lung were to be found in a mollusc,where would it be located?

Which mollusc clade includes members that undergo embryonic torsion?

What distinguishes complete metamorphosis from incomplete metamorphosis in insects?

The members of which clade in the phylum Cnidaria occur only as polyps?

Insects are a diverse and highly successful animal group.The internal anatomy of insects includes the following characteristics,with the exception of

By which structures are nematocysts most likely to reach the skin of sea slugs?

Which of the following organisms would you expect to have the largest surface-area-to-volume ratio? Assume that all of the following are the same total length.

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 spines of sea stars have a function most similar to that of

The crown-of-thorns sea star,Acanthaster planci,preys on the flesh of live coral.If coral animals are attacked by these sea stars,then what actually provides nutrition to the sea star,and which chemical (besides the toxin within their nematocysts)do the corals rely on for protection?