ENTOMOLOGY 205 Exam 2 November 1, 2000

NAME: _________________________________ SS#: ____________


Read directions and questions carefully. Think before you respond.


I. FILL-INS (4 pts each question). Fill in each blank with the most accurate and appropriate word or phrase that completes the sentence in the context of this course.

1. A female insect releases a pheromone from a _____________________________. A male will likely use chemoreceptors located on his ________________________ to find the female which he does by ________________ toward the pheromone. This an an example of ____________________________ orientation behavior

2. The chemical known as juvenile hormone conveys the specific message ___________ _______________. It is released from a gland where it is produced, being transported via the _______________ to the action site of _____________________________. What specific (observable) first change happens at the action site.? _______________________

3. An insect with a stridulatory organ is (give example) ____________________ and it uses this structure to __________________________________. Diagram and label the typical structure of a stridulatory organ:

 4. ID these geological events (use years, era/period or other distinctive reference):

1. age of trilobites

2. Age of Insects

3. appearance of flea/lice orders

4. appearance of complete metamorphosis

5. Two color forms of the single species of peppered moth adult is an example of ______________ morphism. What was selective advantage of the darkered colored morph before the Industrial Revolution _______________________________ and after the Industrial Revolution? ________________________________. What did coal soot do to the moth's environment? ________________________________________

6. An egg is produced in the ___________________ of the female ovary. The female uses an _________________________ to place her fertilized egg in plant tissue, the egg laying condition termed _________________________. How do we know if the female is being a "good" mother? ____________________________________________

7. Hymenoptera females lay unfertilized eggs which develop into normal, healthy (list stage

of development) _________ and then into the adult __ ____________. This is an example

of ___________________ metamorphosis and of _________________ development. Eggs

aphid females lay in the spring develop into _____________________. In the fall, aphid

eggs result in adults that can ___________.


8. The basis of evolution are that species produce _____________________ than can

ultimately survive. Survivors, the __________________ pass on _____________

___________ to the next generation. Humans use _____________________ to develop

breeds (varieties) in domesticated animals (like cattle, dogs, bees, etc) while selection in

wild non-managed organisms is ______________________________.


9. Thornbug nymphs communicate ________________ via use of ______________________

Bark beetles communicate _______________________ via use of __________________

Gypsy moth females communicate __________________ using ____________________

Tent caterpillars communicate ______________________ using _________________

10. Firefly light comes from the chemical _____________. The light organs are on the

_________________ of the adult. The predatory firefly signals the male of her species by

_______ and she secures a meal by ____________________.


11. Explain 2 (two) of these defensives used by insects: Do only 2

flash pattern disruptive coloration reflex bleeding aposomatic coloration






12 Monarch butterlies leave Delaware in the fall and fly to _______ to overwinter in the

____________ stage. Another insect that stays to overwinter in Delaware is the

_____________________: it overwinters as a (an) _________________


13. Fertilization of eggs in most insects is _____________. An insect with indirect sperm

transfer is the ___________________ which places sperm in ______________________

for the female to secure. Inside the shell what is the major material of an insect egg?



14. Females with parental care may lay ________ eggs compared with other females. Some

male insects, such as ________ exhibit parental care by __________. A few Hymenoptera

lay one egg but from which many individual larvae result, a condition termed



15. A kinesis is different from a taxis orientation in that in a kinesis movement is ___________

Give an example of both a kinesis and a taxis:



II. DIAGRAMS (6 pts. each) Answer all 5 questions.

16. A grasshopper is about to munch on the blade of grass. If there is a sugar in the grass

blade diagram the route it will follow from the grass blade until it reaches a muscle cell in

the antenna.



17. Diagram and label the mesothorax of an insect (cross section) that has either direct or indirect flight muscles. I have diagramed the ______________ insect and it has _________________ flight muscles:


18. Fill in blanks for diagram below:


19. In the video RIVALS: THE MATING GAME mating behavior was shown in 9

insects. Diagram one of those 9 (or use words/description if you prefer) below.

20. Spider use of silk was featured in a video and in the reading by Wm Sheer. Diagram

three evolutionary stages of use of silk by spiders from most basic to most complex (pick

any of the intermediate stages you like but label what you draw.)


III. SHORT ANSWER (10 pts). Answer the question below as completely as possible. You may use incomplete sentences, phrases, diagrams or other conventions in your response.

21. The breathing system of insects was given as one of the reason why insects can not grow to the size of an elephant yet air exchange simplicity might also be one of the reasons insects are so successful. Explain how this is so. Can you think of another system in insects where the same things might prevail? ID another system and briefly why it both limits size of insect bodies yet also might be a reason for their success as small bodied creatures.



















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