The female gametophyte in flowering plants is the
a. ovary.
b. seed.
c. embryo sac.
d. megasporocyte.
e. ovule.
C
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Which organism is used to initiate the fermentation of cabbage to make sauerkraut?
A. Propionibacterium B. Saccharomyces cerevisiae C. Streptococcus lactis D. Spirulina E. Leuconostoc mesenteroides
In an experiment on the effects of deforestation of a portion of a northern temperate deciduous forest, all the trees were removed from a small mountainside watershed area and herbicides were applied for three years to prevent regrowth. Measurements of the concentration of calcium (an important nutrient) in runoff water were taken both before and after the deforestation. Monthly measurements also were made in a similar watershed in another part of the same forest that had been left undisturbed. The findings are displayed in the graph below. (There is an image in your packet #101-105) 2002 test Which of the following factors affecting the hydrologic cycle would have the LEAST impact on calcium loss from the disturbed watershed?
(A) Total precipitation (B) Surface runoff (C) Evaporation (D) Transpiration (E) Porosity of soil
Agar, which is used as a thickening agent in the production of ice cream, comes from
A.) red algae B.) dinoflagellates C.) euglenoids D.) fungi
Which of the following sulfur species is highly toxic?
a. hydrogen sulfide b. dimethylsulfide c. elemental sulfur d. calcium sulfate