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					                                  INTRODUCTION TO INVERTEBRATES QUIZ

_____1. Which of the following is not a characteristic of all animals? 
 a) They ingest food. 
 b) They produce gametes
by meiosis. 
 c) The reproduce asexually by mitosis. 
 d) Food is digested in a central cavity. 
 e) The adult form is
diploid in a diplontic life cycle.

_____2. Which statement is not true about invertebrate animals? 
 a) The majority of animal species are invertebrates.

 b) Many invertebrate species live in a marine environment. 
 c) Most animal phyla are invertebrate. 
 d) Fossils of all
major invertebrate species are known from the start of the Cambrian period. 
 e) Invertebrates lack a nervous system.

_____3. The term "coelom" is based on the Greek root word meaning 
 a) stuck in one place b) without a backbone c)
little spear d) cold e) cavity

_____4. Animals that have three layers of embryonic tissue and have one solid mass of tissue rather than tissues 
organs nestled inside a body cavity are 
 a) acoelomate b) eucoelomate c) pseudocoelomate d) quasicoelomate e)

_____5. Animals that have three layers of embryonic tissue but have organs in a cavity that is Not completely lined with
mesoderm are 
 a) acoelomate b) eucoelomate c) pseudocoelomate d) quasicoelomate e) coelomate

_____6. Animals that have three layers of embryonic tissue with organs in a cavity that is completely lined with
mesoderm are 
 a) quasicoelomate b) coelomate c) acoelomate d) pseudocoelomate e) eucoelomate

_____7. Coelomates that develop with the blastopore becoming the mouth are 
 a) gastrocoelomate b) blastocoelomate
c) protostomes d) deuterostomes e) tripleblastic

_____8. A sponge actually feeds by 
 a) acting as a net in a current that sweeps food particles through it. 
 b) squeezing
the spongocoel cavity and sucking debris in and out through the osculum. 
 c) the beating of the flagella of collar cells,
forming a current; food is absorbed by collar cells. 
 d) the beating of collar cells form a current from osculum to pores;
the food is engulfed by amoebocytes 
 in the central cavity of the sponge.

_____9. Which of these is not a characteristic of sponges? 
 a) a sessile filter feeder 
 b) body wall has two cell layers

 c) flagellated collar cells move water 
 d) water enters through a single cavity, the osculum 
 e) amoeboid cells digest
food and make skeletal fibers and gametes

_____10. Which statement about sponges is not correct? 
 a) The larval form is ciliated and able to swim to a suitable
 b) Sponges are classified on the basis of their type of skeletal material. 
 c) Sponges resemble a colony of
protozoan cells more than a multicellular animal. 
 d) Sponges are thought to be on the evolutionary pathway leading to
more complex animals such as corals and worms. 
 e) Sponge cells are capable of transforming from one cell type to
another, in a type of plasticity not seen in other kinds of animals.

_____11. Of the following organisms, which is the most evolutionarily advanced, with more complex body structure? 
roundworms b) cnidaria c) sponges d) flatworms

_____12. Which of the following types of skeletal material is not found in at least some sponges? 
 a) spicules of calcium
carbonate    c) spicules of silica 
 b) spicules of fibrous protein       d) spongin of fibrous protein

_____13. Which of the following statements about sponges is Not correct? 
 a) Sponges have no nerve fibers. 
Sponges have no fully developed muscle fibers. 
 c) Amoeboid cell capture food particles from the water. 
 d) Sponges
may reproduce asexually by budding or by regeneration from a small piece. 
 e) Cells of a single sponge will recognize
others of the same kind and re-aggregate if the cells are separated and allowed to re-associate.

_____14. Which of the following are not cnidaria? 
 a) corals         b) planaria   c) sea anemones      d) hydrozoa     e)
Portuguese man-of-war

_____15. Which of the following statements is not correct about cnidaria? 
 a) The adult body is bilaterally symmetrical.

 b) Most are found in shallow coastal marine environments. 
 c) There are two tissue layers, an outer epidermis and inner
 d) Stinging cells contain a threadlike nematocyst released to capture prey. 
 e) A jellylike mesoglea
contains cells that form a nerve net throughout the body.

_____16. Which body structure describes the freshwater hydra? 
 a) a swimming medusa with mouth pointing downward.

 b) a swimming medusa with mouth pointing upward. 
 c) a sessile medusa with mouth pointing upward. 
 d) a sessile
polyp form with mouth pointing downward. 
 e) a freely moving polyp with mouth pointing upward.

_____17. A hydra moves via 
 a) nematocysts 
 b) alternation of generations 
 c) contraction of the nerve net 
epitheliomuscular cells in the epidermis 
 e) epitheliomuscular fibers in the mesoglea.

_____18. What system does the cnidaria and comb jellies have that sponges lack? 
 a) respiratory            b) nervous c)
circulatory d) excretory e) reproductive

_____19. A floating Portuguese man-of-war is 
 a) a cubozoan 
 b) merely a non-circular jellyfish 
 c) a free-swimming
polyp in the hydra group 
 d) a first animal with complete organs systems 
 e) in the hydra group and is a colony
composed of different types of individuals

_____20. Which statement about cnidaria is Not true? 
 a) Reproduction is both sexual and asexual. 
 b) Some forms are
sessile and others are motile. 
 c) They live in either marine or freshwater environments. 
 d) Tentacles are used to
capture prey and put it into the mouth. 
 e) The body plan is tube-within-a-tube, with both mouth and anus.

_____21. Almost all sponges are 
 a) sessile b) motile c) pink d) Both A and B. e) None of the above.

_____22. Which of the following designates an animal with a true body cavity? 
 a) coelomate b) acoelomate c)
pseudocoelomate d) None of the above.

_____23. Which of the following designates an animal with a false body cavity? 
 a) coelomate b) acoelomate c)
pseudocoelomate d) None of the above.

_____24. Which of the following designates an animal with no body cavity? 
 a) coelomate                b) acoelomate     c)
pseudocoelomate d) None of the above.

_____25. Cephalization 
 a) is a feature of most vertebrates, including sponges 
 b) is characterized by the concentration
of sensory organs in the anterior end 
 c) occurs in marine protozoa 
 d) results when the brain does not develop properly

_____26. Planaria feed by 
 a) attaching with a sucker(s) and extracting blood. 
 b) tearing and sucking food particles via
a mid-belly dead-end tube. 
 c) slurping food particles through a mouth and excreting waste via an anus. 
 d) soaking all
nutrients from the environment through its thin epidermal surface.

_____27. In flame cells, 
 a) light is detected. 
 b) ciliated sperm are stored. 
 c) undigested food is expelled. 
 d) slow
fires actually burn food for energy. 
 e) cilia drive fluids through tubules for excretion.

_____28. Planaria move by 
 a) flame cells. 
 b) small pseudopodia. 
 c) lateral undulation of muscles. 
 d) expulsion of
fluids as with squid. 
 e) secreting a film of mucus and pushing against it with epidermal cilia.

_____29. A person working in a rice paddy in Asia becomes infected with the liver fluke by 
 a) eating infected snails.

 b) drinking water contaminated with eggs. 
 c) eating infected undercooked or uncooked fish. 
 d) swimming or wading
in infected water, where the cercariae enter the skin.

_____30. The name of the free-swimming, ciliated stage that hatches from a trematode egg is 
 a) miracidium b)
sporocyst c) cercaria d) scolex d) proglottid

_____31. Which of the following statements is Not correct about flatworms? 
 a) There are three complex tissue layers.

 b) Flatworms may be either free-living or parasitic. 
 c) Flatworms have a sac body plan, with only a mouth and no
 d) Parasitic flatworms have a well-developed head with eyespots and nerves concentrated into a brain. 
 e) Most
planaria are found in marine environments, but some dwell in freshwater and moist terrestrial environments.
_____32. Which of the following statements is not true about flatworms? 
 a) Tapeworms have a ladder-type nervous
 b) Planaria contain pigmented, photosensitive eyespots. 
 c) Liver flukes and blood flukes are endoparasites in
 d) Schistosomiasis is a common human blood disease caused by flukes in tropical areas. 
 e) Tapeworms are
hermaphroditic, having both male and female reproductive structures in each proglottid.

_____33. How could you possibly become infected with adult tapeworms? 
 a) eating insufficiently cooked pork 
being bitten by a mosquito 
 c) ingesting eggs in contaminated water 
 d) eating freshly peeled fruit 
 e) All of the above
are correct.

_____34. The head region of a tapeworm is called the 
 a) proglottid b) cercaria c) sporocyst d) scolex e) glycocalyx

_____35. The segments of a tapeworm consisting primarily of eggs, which hang in bags as a long chain behind the head,
are called 
 a) proglottids b) cercariae c) sporocysts d) scolexes e) glycoalyxes

_____36. Which statement is not correct about roundworms? 
 a) There are three layers of tissues in the body. 
Roundworms have a tube-within-a-tube body plan. 
 c) There is an internal body cavity called a pseudocoelom. 
Roundworms have a smooth unsegmented outside body wall. 
 e) Roundworms are all carnivores and may be free-living
or parasitic.

_____37. Which of these parasitic worms is not a nematode? 
 a) Ascaris 
 b) Trichinella 
 c) Wuchereria 
 e) the worm that causes schistosomiasis

_____38. Which of these parasites does not enter the mouth of its human host and leave as eggs with the human feces?

 a) tapeworm b) pinworm c) Ascaris d) hookworm

_____39. Larval Trichinella worms live in the 
 a) liver   b) lungs   c) intestines d) lymph glands   e) skeletal muscle

_____40. Elephantiasis is an enlargement of legs, arms, scrotum, and other tissue caused by 
 a) an infection of the human
coelom by Ascaris. 
 b) a large number of Trichinella worms encysting in our muscles. 
 c) contracting a disease that
usually occurs in elephants. 
 d) microscopic roundworms that reproduce and clog lymph glands, causing limbs to swell.

 e) a protozoan that lives in tropical roundworms and, when ingested by humans, causes muscles to bloat.

_____41. Choose from among the following organisms the one that lacks body cavities and a vascular system. 
roundworms b) flatworms c) rotifers d) insects e) mollusks

_____42. Which of the following is present in a roundworm but absent in a flatworm? 
 a) coelomic cavity 
 b) digestive
 c) endoderm 
 d) coelomic cavity and digestive cavity 
 e) coelomic cavity, digestive cavity, and endoderm

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