Biology Test Biology Ecology & Environmental Interactions 3

Question 1

Eutrophication of a lake is most directly caused by

Accepted Answer

Excess nutrient runoff stimulating algal blooms

Answer

Increased predation by invasive fish species

Answer

A decrease in water temperature

Answer

Introduction of filter-feeding organisms

Question 2

Which of the following is an example of a density-dependent limiting factor?

Accepted Answer

Disease spreading more rapidly in a crowded population

Answer

A volcanic eruption destroying habitat

Answer

A severe drought killing vegetation

Answer

A sudden frost killing organisms regardless of population size

Question 3

In an ecological pyramid of biomass, which level always has the greatest biomass?

Accepted Answer

Producers

Answer

Top carnivores

Answer

Secondary consumers

Answer

Primary consumers

Question 4

Which relationship exists between clownfish and sea anemones, where both organisms benefit?

Accepted Answer

Mutualism

Answer

Parasitism

Answer

Commensalism

Answer

Competition

Question 5

The reintroduction of wolves to Yellowstone National Park caused changes that eventually led to stabilization of riverbanks through a process called

Accepted Answer

A trophic cascade

Answer

Competitive exclusion

Answer

Ecological succession

Answer

Carrying capacity regulation

Question 6

Which process in the carbon cycle involves the release of CO2 from the burning of ancient organic matter?

Accepted Answer

Combustion of fossil fuels

Answer

Photosynthesis

Answer

Transpiration

Answer

Nitrogen fixation

Question 7

Resource partitioning among competing species in the same habitat is an example of

Accepted Answer

Character displacement reducing direct competition

Answer

Competitive exclusion

Answer

Niche overlap maximization

Answer

Allopatric speciation