AP Bio: 8.3-8.5 Community Ecology

Which of the following is an environmental influence on populations? (Select all that apply)

• density

• distribution

• age structure

A group of interbreeding individuals occupying the same area is best called

• community
• population
• ecosystem
• symbiotic relationship

Organisms with low birthrates and increased care of young, would follow which of the following survivorship curves?

• Type I

• Type II

• Type III

Predation, space/territory, disease are examples of:

• density dependent limiting factors

• density independent limiting factors

When two species of cattails are grown together, they grow at different water depths and coexist.  When grown alone, they grow at similar water depths.  Which of the following is best demonstrated by the data?

• natural selection
• character displacement
• resource partitioning
• ecological succession

Starfish are probably the most important predator in the shallow ecosystem because they eat basically anything that they can come across. Their feeding activities control the whole ecosystem. This is an example of the starfish ___.

• habitat
• biotic factors
• tolerance level
• niche

Type of symbiosis: Skunks often live in burrows that have been dug and abandoned by woodchucks.

• commensalism

• mutualism

• parasitism

• predation

In the woods, there are hawks and robins. They both try to occupy the same niche by competing for worms as the only source of food in that same area at that same time. The hawks outcompete the robins, and the robins are forced to leave that area. This is an example of:

• Mutualism

• The competitive exclusion principle

• Commensalism

• Neutralism

According to the population pyramid of this country, its population is most likely...

• growing slowly.
• growing rapidly.
• decreasing.
• not changing.

What three factors can affect ANY population's growth rate?

• Birthrate, death rate, migration
• disease, predation, migration
• medicine, agriculture, industry
• life expectancy, sanitation, vaccines