1 Entomology 462 Name (print) KEY May 6, 2009 Exam I (mid-term) Multiple Guess - Select the BEST answer that completes the sentence or answers the question. Studies have shown that your first guess is usually the best! Really, there are probably only two answers that may fit so you have to decide which of these two is best. Remember the “rules of engagement,” - Ask Questions! Good luck. B____ 1. Annelids and arthropods both have exoskeletons. The major body characteristic that separates these two phyla is: A. presence of antennae; B. open or closed circulatory system; C. bilateral symmetry; D. segmentation. D____ 2. The horseshoe crab is not really a crab because horseshoe crabs have: A. no antennae; B. a pair of chelicerae; C. no maxillae; D. all of these. B____ 3. Scorpions are normally shown in deserts, but most of the species live in the: A. temperate north; B. tropics of the world; C. Australian continent; D. subtropical Asian zone. D____ 4. Which of the following is not a mandibulate appendage? A. mandibles; B. labium; C. maxillary palps; D. pedipalps. B____ 5. Ticks produce very large numbers of eggs because they: A. have a desire to overrun the earth!; B. have very “risky” life cycles that require finding two or more hosts during their life cycles; C. have many predators; D. are highly susceptible to drought. A____ 6. A big spider was seen by a couple in the basement of their house. When they jumped in horror, the spider turned towards them and raised up and down what looked like its dark black front legs, took a couple of steps towards the couple, then ran away. This spider was most likely: A. a male looking for love (waving its pedipalps); B. a tarantula threatening the couple; C. a funnel web spider that is very dangerous; D. a black widow. D____ 7. Spiders use silk to: A. capture prey in webs; B. line their burrows; C. encase their egg mass; D. all of these. B____ 8. Soft-shelled crabs are preferred for eating because: A. they have a naturally thin shell; B. they have recently molted and haven’t put calcium carbonate in the chitin; C. they have large legs with more meat; D. they are really fake food, having been made of reconstituted fish meat. C____ 9. A ground beetle with four larval instars would have how many TOTAL instars in its life cycle? A. four; B. five; C. six; D. three. A____ 10. Dragonflies (Odonata), stoneflies (Plecoptera), and Mayflies (Ephemeroptera) have which of the following in common? A. nymphs called naiads; B. hind wings that are held out to the side of the body; C. sucking, mandibulate mouthparts; D. no caudal appendages. A____ 11. True social insects: A. have castes and division of labor; B. hang out at bars!; C. have females as the primary worker cast; D. use males only as sperm donors. A____ 12. Which of the following groups contains the most species? A. beetles (Coleoptera); B. the insects with an incomplete life cycle (= simple metamorphosis); C. scorpions (Scorpionida); D. moths and butterflies (Lepidoptera).2 Name KEY A____ 13. Which of the following orders is very difficult to characterize because of the large number of diverse forms? A. Hemiptera (true bugs and bug-like insects); B. Dermaptera (earwigs); C. Lepidoptera (butterflies & moths); D. Siphonaptera (fleas). C____ 14. In order to achieve more powerful flight, there is a general trend in insects to: A. increase the size of the thoracic muscles; B. enlarge the wings; C. eliminate one pair of wings or join the wings together to operate as one unit; D. become smaller and more streamlined. A____ 15. It’s difficult to rapidly approach an insect without it detecting you. This is because the insect eyes more easily detect motion because: A. each eye facet (ommatidium) sees only a small section of the visual field; B. insects detect special motion colors; C. compound eyes see infra-red; D. their “flicker frequency” is higher than humans. C____ 16. Birds use stones in their crop to grind up food. The equivalent of this in the insect gut is the: A. gastric caecum; B. Malphigian tubules; C. proventriculus; D. hypopharynx. C____ 17. Most crickets have tympana on their front legs. These are used to hear sounds made by: A. the males rubbing their legs together; B. rubbing the legs against the wings; C. rubbing a rasp and file located at the bases of the front wings; D. vibrating their antennae rapidly. D____ 18. Which of the following sexual behaviors is not normal for aphids? A. parthenogensis; B. ovoviviparity; C. bisexuality; D. homosexuality. A____ 19. Fleas often transmit rat tapeworms by: A. serving as an intermediate host where the flea larva eats tapeworm eggs and the tapworm larva encysts in the flea muscles; B. picking up tapeworm eggs on the hairs of their bodies; C. sucking up tapeworm larvae circulating in their mammal host’s blood; D. none of these, tapeworms are transmitted by beetles! C____ 20. Insects protect their midgut cells by: A. coating the surface with mucous; B. having a cuticular lining similar to the exoskeleton; C. forming a peritrophic membrane which is made of cuticular proteins but has pores for movement of nutrients and digestive enzymes; D. continuously growing and replacing cells that are abraded away. B____ 21. During the metabolism of nitrogen, ammonia is the first waste byproduct produced. This is highly toxic to cells and small insects can get rid of this by diffusion. However, most insects rid themselves of nitrogenous waste as: A. urea; B. uric acid; C. nitrous oxide exhaled through the spiracles; D. yellow and brown pigments simply stored in the inert exoskeleton. D____ 22. The wing beat of some flies and bees is more rapid than insect muscle cells can contract and relax. These insects achieve this high beat rate by: A. having a rubber like ligament in the thorax; B. having a special wing shape that flaps rapidly when air moves over it; C. sunning themselves to achieve a high temperature that heats up the muscles, thereby causing the cells to beat faster than expected; D. setting up tension in the thoracic exoskeleton. A____ 23. In order for an insect to molt into the adult stage: A. juvenile hormone production is stopped; B. adult hormone needs to be produced; C. a certain body weight needs to be achieved; D. the programmed number of immature molts has to be undertaken. B____ 24. Which of the following techniques would put you at the