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Ecology: Organisms and Their Environments
Ecology: Organisms and Their Environments

Ecology: Organisms and Their Environments: You Are Our Density Quiz

Think you’ve got your head wrapped around Ecology: Organisms and Their Environments? Put your knowledge to the test. Good luck — the Stickman is counting on you!

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Q. An organism that has a low risk of dying young will probably have which type of survivorship curve?


Type I
Type II
Type III
Type IV
Types I and II
Q. How does nitrogen enter a food chain?


Plants extract it directly from the atmosphere.
Plants extract it directly from the soil.
Bacteria extract it directly from the atmosphere.
Bacteria extract it directly from the soil.
It drops to the ground from the air.
Q. Food chains and food webs are related in what way?


Food webs are simplified food chains.
Food webs are complexes of multiple food chains.
Food chains are simplified food webs.
Food chains are complexes of multiple food webs.
They are not related.
Q. Most of the nitrogen in the world is found in


plants.
the atmosphere.
the soil.
urine.
feces.
Q. For a species, what is a possible consequence of competitive exclusion?


Local extinction
Freedom from competition
Resource partitioning
The first and second choices
The first and third choices
Q. The human population size is currently about 7 billion. If the human growth rate decreased from 0.012 to 0.001 today, how many people would be added to the human population next year?


About 3 million
About 23 million
About 7 million
About 15 million
About 1 billion
Q. An age pyramid for a country has a small base, bulges in the middle, and has a top that is slightly larger than the base. The country is likely


industrialized.
developing.
small.
large.
an island.
Q. What happens to population growth rate as population size approaches the carrying capacity?


It approaches one.
It increases.
It approaches zero.
It becomes negative.
It stabilizes.
Q. Density-dependent factors lead to


exponential growth.
increased growth.
negative growth.
logistic growth.
None of the above
Q. An energy pyramid for a community would contain which of the following information?


Which species are eating each other
The number of trophic levels
The number of consumers
The number of producers
The number of cats

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