Study Guide for Population Ecology and Cycle Test
Cycles
1. Three reservoir of the water, carbon and nitrogen cycle
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Heating of liquid into water vapor
Evaporation of water through plants
Condensation falling to Earth in form of snow, rain, sleet, hail
Superheating of ice into water vapor
Movement of water across land
Movement of water from surface into ground
Movement of water from ground to surface
Sunlight + CO2 + H2O  C6H12O6 + O2
C6H12O6 + O2  CO2 + H2O + ATP (energy)
Eating of organic molecules
Breaking down of dead organisms
Carbon compounds being expose to heat and pressure forming
Fossil fuels
Burning of organic molecules
nitrogen-fixing bacteria convert N2 to NO2- in the soil
decomposers break down wastes and release NH4+into the soil
bacteria take NH4+ from soil and convert it into NO2- and NO3bacteria break down NO3- and release N2 into the atmosphere
plants absorb NO3- through their roots.
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Populations
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group of individuals belong to the same species
# of individuals
# of individuals per unit space
Individuals grouped together
Individuals separated by consistent distance
Individual’s location is independent of others
Amount by which a population size changes within time
Two things that increase growth rate
28. Two things that decrease growth rate
29. Moving into an area
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30. Moving out of an area
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Population grows with unlimited resources
Resources limit growth of population
Limits population growth
Maximum population an ecosystem can support, no growth
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What is the difference between density –dependent factors and density-independent factors?
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Give two examples of density-dependent factors. ____________________________________
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Give two examples of density-independent factors. __________________________________
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Give two processes that would add carbon dioxide into the atmosphere. ______________
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What kind of human activity can reduce the amount of carbon dioxide in the atmosphere?
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How is nitrogen converted into substances that plants can use? _________________________
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