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GC Multiple Choice Exam 2
Terms in this set (18)
Which of the following are mechanisms that stabilize populations involved in predator-prey relationships?
Predators switch to an alternate prey when their preferred prey population is low.Refuges in the environment protect individuals of the prey species.
Evolution of competitive interaction. Natural selection favors ____ of competition and resource overlap via ______ , or more specialization.
Which of the following correctly illustrates the difference between fundamental and realized niches?
Due to competition for resources, the realized niche is a protracted version of the fundamental niche.
Bottom-up control applies _____ control on trophic levels moving up the food web. In contrast, top-down control applies ______ control on trophic levels moving down the food web.
Which of the following are not a group of microbes?
What element makes up the majority of a bacterium?
Which of the following correctly orders ecosystems (highest to lowest) based on their productivity per unit area?
Swamps and Marshes > Temperate Forest > Tundra
Light energy is needed to carry out photosynthesis and produce _______. The range of net efficiency of photosynthesis is _______.
CHO + O2; 1-3%
Which biome or ecosystem has the greatest global primary productivity?
Which of the following is a possible reason why natural ecosystems are more sustainable than human "systems":
Natural ecosystems have adapted to resource limitations
Natural ecosystems have a lower net primary productivity than human "systems"
______ primarily determine(s) ecosystem productivity, but productivity is variable due to differences in _____ across ecosystems.
.temperature and precipitation; nutrients
After a rain event, the residual water vapor in the cloud is
More negative isotopically (relatively less 18O)
The isotopic composition of oxygen in the ocean is ~1.5 per mil lighter now than it was during the last glacial maximum (~18,000 years ago) T/F
The different patterns or spikes of temperature change in Greenland and Antarctica during periods of chaos are due to the earth's orbital parameters. T/F
The main cause of the ice ages in the last 3 myr of Earth's history is thought to be due to:
Milankovitch cycle-related changes in solar insolation over time scales of 23-100 kyr.
The ocean conveyor belt currents are referred to as a _________ circulation because of the salt and temperature differences driving them:
What is the transition between low density surface water and higher density deeper water?
What is thought to be the sink for the "missing" carbon?
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