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APES Unit 1 Test FRQ's
Terms in this set (12)
Describe a biological process by which carbon is removed from the atmosphere and converted to organic molecules.
Photosynthesis- In Photosynthesis, plants take in CO2 from the atmosphere and convert it into glucose/complex carbohydrates.
Describe a biological process by which carbon is converted from organic molecules to a gas and returned to the atmosphere.
A biological process in which carbon is converted into a gas is respiration. In respiration, glucose/complex carbohydrates are broken down to CO2 and released into the atmosphere.
Explain how atmospheric carbon is incorporated into two oceanic sinks.
Atmospheric CO2 can be dissolved directly into the ocean or into precipitation and eventually reach the ocean and can then be taken up by marine organisms for shells and skeletons. Carbon can also react with other elements and form limestone or sedimentary rocks.
Identify one terrestrial sink, other than fossil fuels, that stores carbon for thousands to millions of years.
Sedimentary rocks can store carbon for thousands to millions of years.
Discuss TWO other human activities that increase the concentration of carbon in the atmosphere.
Two human activities that increase the concentration of carbon in the atmosphere are deforestation and slash-and-burn agriculture. In deforestation, we are removing the reservoirs for CO2 by cutting the trees down. In slash-and-burn agriculture, burning organic matter releases carbon into the atmosphere.
Identify an environmental problem that results from elevated atmospheric carbon concentrations.
Discuss one consequence of the problem you identified.
The Greenhouse Effect can occur due to elevated amounts of carbon in the atmosphere. This causes the sun's heat to get trapped and increases the temperature of the planet.
Describe one major way in which the phosphorus cycle differs from the carbon cycle.
Unlike the carbon cycle, the phosphorus cycle does not occur in the atmosphere.
Identify one reason that phosphorus is necessary for organisms.
Phosphorus is necessary for organisms because it is required for cellular respiration.
Identify the class of chemical compounds that is primarily responsible for the thinning of the stratospheric ozone layer and describe TWO major uses for which these chemicals were manufactured.
Chlorofluorocarbons (CFC's) are primarily responsible for the thinning of the ozone layer. CFC's are used in the production of styrofoam and solvent/cleaner.
Describe how the chemical compounds that you identified in part (A) destroy stratospheric ozone molecules. You may include chemical equation as part of your answer.
CL+03 ---> CLO+02
When a CFC molecule comes into contact with ultraviolet light exposure they tend to split causing a chlorine atom to escape. Due to the fact that chlorine by itself is extremely radioactive, it bonds with oxygen atoms that were stolen from a ozone molecule.
Identify the major environmental consequence of the depletion of stratospheric ozone and describe TWO effects on ecosystems and/or human health that can result.
The major environmental consequence of ozone depletion is that the chlorine can gather in one place, such as the ozone hole in Antarctica, and create a hole in the stratospheric ozone which releases UV-B and UV-C. Two effects can be skin cancer in humans and decreased plant productivity.
Ozone formed at ground level is a harmful pollutant. Describe TWO effects that ground-level ozone can have on ecosystems and/or human health.
In humans, ground-level ozone can cause pain or burning in the chest and shortness of breath. In the environment, it can lead to reduced agricultural crop and commercial forest yields.
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