Green Revolution techniques ________
A) have contributed to an increased diversity of foods in the human diet
B) have increased crop yields but may not be sustainable
C) focus on preserving biodiversity
D) focus on organic farming
E) focus on sustainability
Answer: B
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Zinc, Zn, is more easily oxidized than copper, Cu. What happens the moment after metal strips of these metals come into contact with each other?
A. The surface of the copper appears moist and cloudy as the zinc metal oxidizes and gets dissolved into Zn(aq) ions. B. The zinc metal begins to turn a greenish color indicating the presence of the formation of cupric oxide, CuO. C. The zinc metal immediately begins depositing electrons onto the surface of the copper, thus coating the copper with a white powder of zinc oxide, ZnO. D. Nothing happens. An immediate buildup of charge in either material prevents continued oxidation-reduction from occurring.
Of Earth's four overlapping spheres, which of the following does not involve material above Earth's surface?
a) atmosphere b) lithosphere c) biosphere d) hydrosphere
Which of the following are the major factors that determine a population's growth rate?
A) birth rate, death rate, emigration, immigration B) survivorship, natural selection, mutation, extinction C) immigration, climate, emigration, biotic potential D) limiting factors, carrying capacity, mutation rate, inbreeding E) adaptation, competition, birth rate, emigration
The term "ladder fuels" refers to ________.
A. an evolutionary hierarchy of flammable plants, from primitive ferns to complex flowering trees B. a hierarchy of carbon-rich flammable materials, from wood to peat, coal, and petroleum products C. extinguishing materials used by urban firefighters D. vegetation of varying heights, which allow fire to quickly climb upward E. fuel made of old woodworking scraps and workbenches