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Which cells in a sponge are primarily responsible for trapping and removing food particles from circulation water?

Choanocytes

Which of the following is correctly associated with sponges?

osculum

A sponge's structural materials (spicules,spongin) are manufactured by the

amoebocytes

In terms of food capture, which sponge cell is most similar to the cnidocyte of a Cnidarian

Choanocyte

A radially symmetrical animal that has two embyronic tissue layers probably belongs to which phylum?

Cnidaria

Which of the following are characteristics of the phylum Cnidaria?
1.A gastrovascular cavity
2.a polyp stage
3.a medusa stage
4. cnidocytes
a pseudocoelum

1,2,3,4

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

They may use a gastrovascular cavity as a hydrostatic skeleton

Corals are most closely related to which group?

sea anemones

Which characteristic is shared by both cnidarians and flatworms?

a digestive system with a single opening

generally, members of which flatworm class(es) are nonparasitic?

Turbellaria

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

encysted in the muscles of an animal, such as a cow or pig

Which of the following correctly characterizes the phylum Rotifera?

parthenogenic reproduction

A lophophore is used by ectoprocts and brachiopods

for feeding

While snorkeling, a student observes an active marine animal that has a series of muscular tentacles bearing suckers associated with its head. Segmentation is not observed, but a pair of large, well-developed eyes is evident. The student is observing an animal belonging to which class?

Cephalopods

Which molluscan class includes organisms that are primarily suspension feeders?

bivalves

Some species of which of the following annelid classes release an anticoagulant that is of medical significance?

Hirudinea (leeches)

Humans most frequently acquire trichinosis by

eating undercooked pork

The heartworms that can accumulate within the hearts of dogs and other mammals have a pseudocoelum, an alimentary canal, and an outer covering that is occasionally shed. To which phylum does the heartworm belong?

nematoda

Among the invertebrate phyla, phylum Arthropoda is unique in possessing members that have

wings

What distinguishes complete metamorphosis from incomplete metamorphosis in insects?

radically different appearance between adults and earlier life stages

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

an open circulatory system

Which of the following describe(s) echinoderms?

Only A and B are true (A=They have an endoskeleton of hard calcareous plates, B=Tube feet provide motility in most species)

A stalked, sessile marine organism has several feathery feeding structures surrounding an opening through which food enters. The organism could potentially be a cnidarian, a lophophorate, a tube-dwelling worm, a crustacean, or an echinoderm. Finding which of the following in this organism would allow the greatest certainty of identification?

A water vascular system

Protostomes that have an open circulatory system and an exoskeleton of chitin are part of which phylum?

Arthropoda

Protostomes with a unique drape of tissue that may secrete a shell are part of which phylum?

Mollusca

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

Cnidaria

Deuterostomes that have an endoskeleton are part of which phylum?

Echinodermata

Protostomes that have a closed circulatory system and obvious segmentation are part of which phylum?

Annelida

An elementary school science teacher decided to liven up the classroom with a salt-water aquarium. knowing that salt-water aquaria can be quite a hassle, the teacher proceeded stepwise. First, the teacher conditioned the water. Next, the teacher decided to stock the tank ith 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 gastropod varieties. Lastly, some vertebrates-a parrotfish and a clownfish- were added. She arranged for daily feedings of copepods and feeder fish.

One day, little Tommy (a student in an under-supervised class of 40 fifth graders) got the urge to pet Nemo (the clownfish) who was swimming amon 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 were sticky feeling. A few hours later, Tommy was in the nurse's office with nausea and cramps. Microscopic examination of hisfingers would probably have revealed the presence of

nematocysts

An elementary school science teacher decided to liven up the classroom with a salt-water aquarium. knowing that salt-water aquaria can be quite a hassle, the teacher proceeded stepwise. First, the teacher conditioned the water. Next, the teacher decided to stock the tank ith 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 gastropod varieties. Lastly, some vertebrates-a parrotfish and a clownfish- were added. She arranged for daily feedings of copepods and feeder fish.

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

Sea star

An elementary school science teacher decided to liven up the classroom with a salt-water aquarium. knowing that salt-water aquaria can be quite a hassle, the teacher proceeded stepwise. First, the teacher conditioned the water. Next, the teacher decided to stock the tank ith 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 gastropod varieties. Lastly, some vertebrates-a parrotfish and a clownfish- were added. She arranged for daily feedings of copepods and feeder fish.

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

tube feet

A land snail, a clam, and an octopus all share

a mantle

Which phylum is characterized by animals that have a segmented body?

Arthropoda

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