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| 1 | Nematodes are the most important pseudocoelomate animals, both in terms of numbers and their impact on humans. |
 | A) | True |
| B) | False |
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| 2 | Based on ribosomal RNA gene analyses, which one of the following phyla is not a member of the clade Ecdysozoa? |
| A) | Nematoda |
| B) | Nematomorpha |
| C) | Rotifera |
| D) | Kinorhyncha |
| E) | Priapulida |
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| 3 | Nematodes may be which of the following? |
| A) | Free-living |
| B) | Saprozoic |
| C) | Coprozoic |
| D) | All of the above |
| E) | None of the above |
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| 4 | Virtually every species of vertebrate and many invertebrates serve as hosts for one or more types of parasitic nematodes. |
| A) | True |
| B) | False |
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| 5 | A hydrostatic organ is highly developed in nematodes, and much functional morphology of nematodes can be best understood in the context of the extremely low hydrostatic pressure in the pseudocoel. |
| A) | True |
| B) | False |
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| 6 | Which of the following is incorrect? |
| A) | Cuticle?noncellular, secreted by the hypodermis |
| B) | Collagen?a structural protein also found in vertebrate connective tissue |
| C) | Muscles?only contract longitudinally in nematodes |
| D) | Parastic nematodes?have an advanced Krebs cycle for metabolism |
| E) | Phasmids?similar to the sensory amphids |
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| 7 | Which of the following is incorrect? |
| A) | Hookworm?Ancylostoma duodenale |
| B) | Pinworm?Enterobius vermicularis |
| C) | Intestinal roundworm?Trichuris trichiura |
| D) | Trichina worm?Trichinella spp |
| E) | All of the above are correct |
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| 8 | It is estimated that nearly 1.27 billion people are infected worldwide with Ascaris lumbricoides. |
| A) | True |
| B) | False |
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| 9 | Which one of the following diseases is NOT caused by filarial worms? |
| A) | Elephantiasis |
| B) | River blindness |
| C) | Swimmer's itch |
| D) | Dog heartworm |
| E) | All of the above are caused by filarial worms |
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| 10 | Which of the following is not correct? |
| A) | The popular name for Nematomorpha is "horsehair worms" |
| B) | The dog heartworm is troublesome, but not dangerous |
| C) | Members of the Phylum Kinorhyncha are all marine worms bearing thirteen segments with spines but no cilia |
| D) | The Phylum Loricifera have a protective external case called a lorica |
| E) | Members of the Phylum Priapulida are marine worms that burrow with their mouths at the surface of the sediment. |
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| 11 | The Onychophora? |
| A) | Show no external segmentation except for paired appendages |
| B) | Are called "water bears" |
| C) | Have a pseudocoel |
| D) | Have marine trochophore larvae |
| E) | None of the above is correct |
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| 12 | Which of the following is considered to be in clade Panarthropoda(arrow) |
| A) | Sipuncula |
| B) | Pogonophora |
| C) | Ectoprocta |
| D) | Tardigrada |
| E) | Phoronida |
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| 13 | Which of the following is NOT considered to be an ecdysozoan arrow) |
| A) | Brachiopoda |
| B) | Loricifera |
| C) | Onychophora |
| D) | Priapulida |
| E) | Tardigrada |
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| 14 | Which of the following is mismatched(arrow) |
| A) | Phylum Loricifera?tiny animals that live in spaces between marine gravel |
| B) | Phylum Onychophora?caterpillar-like velvet worms or walking worms |
| C) | Aysheaia?famous fossil onychophoran from the Burgess shale deposits of 500 million years ago |
| D) | Phylum Tardigrada?minute "water bears" |
| E) | All of the above are correct |
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| 15 | Which of the following is NOT an external feature of the onychophorans(arrow) |
| A) | Tubercles |
| B) | Antennae |
| C) | Chelicerae |
| D) | Mandibles |
| E) | Unjointed legs |
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| 16 | When disturbed by a predator, an onychophoran can launch two streams of sticky fluid that rapidly hardens from its slime glands. |
| A) | True |
| B) | False |
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| 17 | Onychophorans are similar to insects in that they have a tracheal system that ramifies to all parts of the body and communicates with the outside by means of spiracles. |
| A) | True |
| B) | False |
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| 18 | The onychophorans have a closed circulatory system. |
| A) | True |
| B) | False |
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| 19 | The majority of onychophorans produce living young from eggs hatched inside the uterus. |
| A) | True |
| B) | False |
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| 20 | Which of the following is NOT true about the tardigrades(arrow) |
| A) | They have an elongated, cylindrical body that is unsegmented |
| B) | The trunk bears eight pairs of short, stubby, jointed legs |
| C) | They are covered by a nonchitinous cuticle that is periodically molted |
| D) | Most of the body cavity is a hemocoel, with a true coelom restricted to the gonadal cavity |
| E) | They can enter a stage of suspended animation called cryptobiosis during which the water content of the body is reduced from 85 percent to 3 percent |
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| 21 | Tardigrades and rotifers share some characteristics, particularly their reproduction and cryptobiotic tendencies. |
| A) | True |
| B) | False |
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| 22 | Arthropods are similar to annelids in that they both have? |
| A) | Cilia |
| B) | An open circulatory system |
| C) | Conspicuous metamerism |
| D) | Intersegmental septa |
| E) | None of the above is correct |
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| 23 | Compared with annelids, tagmatization of arthropods is more specialized for a variety of purposes. |
| A) | True |
| B) | False |
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| 24 | The Onychophora? |
| A) | Show no external segmentation except for paired appendages |
| B) | Are called "water bears" |
| C) | Have a pseudocoel |
| D) | Have marine trochophore larvae |
| E) | None of the above is correct |
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| 25 | Which of the following is NOT considered to be an ecdysozoan phylum(arrow) |
| A) | Brachiopoda |
| B) | Nemotoda |
| C) | Onychophora |
| D) | Priapulida |
| E) | Tardigrada |