Ecology Test #2

Which of the following is true of density-dependent limiting factors?

• They have a larger impact on big populations.

• They have a larger impact on small populations.

• They impact big and small populations equally.

• They tend to be caused by abiotic factors.

A population of mice occupies a tree stump. For ten years, the population has been stable.

Which of the following would likely cause the number of mice to begin to decrease?

• An increase in predators (who eat them)

• A decrease in disease

• A decrease in competition between the mice

• An increase in mating season

What pattern of growth will a population with limited resources show?

• Exponential

• Logistic

• Density-dependent

• Density-independent

Conditions in the environment that impact the size of the population are called

• limiting factors.

• populations.

• habitats

• niches.

Which factor is a density-dependent limiting factor on the population of a species?

• Predation

• Unusual weather

• Natural disasters

• Seasonal variation

Based on the chart, which of these events would have the biggest immediate impact on the Georgia Black Bear population?

• large scale forest fires

• damming lakes and rivers

• introduction of the bald eagle

• restriction on humans hunting bears

What type of population growth is shown in the graph?

• Logistic growth

• Exponential growth

• Density-dependent growth

• Carrying capacity growth

Tapeworms feed off of their host organism. This makes them a __________.

• competitor

• predator

• host

• parasite

An insect gathers pollen and nectar for food, but at the same time is aiding in the plant’s reproduction by spreading pollen to other flowers it visits.

What does this relationship demonstrate?

• Predation

• Commensalism

• Mutualism

• Parasitism

In natural ecosystems, predators will tend to lower the prey population, meaning less _________________ between members of the prey population.

• competition

• infestation

• parasitism

• symbiosis