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APES Chapter 3

Terms in this set (15)

What is a product of photosynthesis?
glucose
What group of organisms perform photosynthesis?
autotrophs
Which groups of organisms perform cellular respiration?
Autotrophs, heterotrophs, decomposers
Approximately how much of the potential energy available from the Sun's rays hitting Earth is used in photosynthesis?
1 percent
How is the majority of energy within an ecosystem lost?
Heat loss
What law best related to energy loss within an ecosystem?
Second law of thermodynamics
At which stage of the hydrologic cycle are conditions most likely to contribute to the development of an algal bloom?
runoff
Which is considered the most important element in living organisms?
Carbon
What is the effect of deforestation on the carbon cycle?
Increased amount of CO2 in the atmosphere
Which element is most abundant in the atmosphere?
Nitrogen
Which human activities affect the nitrogen cycle?
Use of fertilizers and combustion of fossil fuels
How does an algal bloom affect the oxygen content of the water?
An algal bloom will cause the oxygen content in the water to decrease, leading to hypoxic conditions
What human activities have affected the phosphorus cycle?
Creation of fertilizers and use of dishwashing detergent
What is a watershed?
Area of land that drains to a water body
What effect would clear-cutting an area within a watershed have on the water quality of a river running through a watershed?
Increase in nutrient concentration in the waters of the clear-cut watershed
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