Approximately what percent of the energy that
enters a trophic level becomes available to the
next trophic level?
a. 2 to 12
b. 3 to 13
c. 4 to 14
d. 5 to 15
e. 5 to 30
E
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A plant that undergoes temporal separation of the steps of photosynthesis is administered a
drug that prevents the stomata from opening at night. What effect will this have on the plant?
a. It will have no effect. b. The light reactions will take place, but the Calvin cycle will not. c. The light reactions will not take place, but the Calvin cycle will. d. Both parts of photosynthesis will not take place.
Which of the following helminths is correctly paired with its portal of entry?
A. Ascaris lumbricoides - enters through the skin B. Taenia solium - eggs or larvae can be ingested C. Enterobius vermicularis - sexual transmission D. Schistomoma species - carried by an insect vector into human
Chief cells secrete:a
trypsin. b. bile. c. pepsin. d. pepsinogen. e. hydrochloric acid.
During swallowing food, which structure moves downward to prevent food from entering the trachea?
a. larynx
b. pharynx
c. glottis
d. epiglottis
e. bronchus