Earth's Spheres
Human Population
Limiting Factors
Carrying Capacity
100
Define all of Earth's spheres.
Geosphere: All of the rocks/minerals present on Earth
Atmosphere:Collection of gasses surrounding Earth
Hydrosphere: All water (solid, liquid, gas) on Earth
Biosphere: All life on Earth
100
Which historical event led to the human population reaching 2 billion? (in the 1890s)
Industrial Revolution
100
What are limiting factors?
factors that can determine the number of organisms in a population; can limit the growth
100
What is carrying capacity?
the maximum population of a species that a habitat can sustain
200
What is an example of the biosphere interacting with the atmosphere?
breathing, humans burning fossil fuels
200
What are two factors that have allowed humans to reduce their limiting factors?
agriculture, medicine, technology
200
What are examples of biotic factors?
food, predators, competition
200
Which line shows exponential growth?
B
300
What is one human impact on the biosphere?
answers can include any impact on living organisms
300
Which regions in the world are predicted to grow the most in the future?
Asia and Africa
300
What are examples of density-independent factors?
weather, hurricane, severe winter
300
Which line shows the carrying capacity?
E
400
How does the hydrosphere interact with the atmosphere?
water cycle (clouds)
400
What is the upper limit for the 95% prediction interval for 2100?
12.4 Billion
400
What happens to predators as prey increase?
Predators increase
400
How is the carrying capacity of a population determined? Can the carrying capacity ever change?
Carrying capacity is determined by the amount of resources available to the population; if limiting factors decrease the carrying capacity increases, if limiting factors increase the carrying capacity decreases
500
Which sphere do populations belong to?
Biosphere
500
What is the lower limit for the 80% prediction interval for 2100?
9.3 Billion
500
What is an example of a density-dependent factor? Explain the impact it has on a population.
disease, competition, food
as the density increases, the impact the factor has on the population increases
500
What is the carrying capacity of the population? Which year did they reach carrying capacity?
990-1000 black bears
2003