CRM 3.2

What happened to the population after it reached the year 1850

• The population fell due to having a new predator

• The population stayed constant because of their predator dying out.

• The population increased because of the abundant food availability

• The population reached carrying capacity due to limiting factors

The lead biologist at the South African wildlife management area has noticed that there had been a significant increase in the population of native birds after a local school had added several bird houses to the management area as part of a community service project.  What does this observation indicate about the birds's relationship to the newly installed bird houses?

• Shelter was a limiting factor for the population

• Shelter was a biotic factor that was needed for the birds

• Shelter was an abiotic factor that was needed for the birds

• Shelter was a selective pressure for the birds

Which of the following correctly describes the impact of an abiotic factor on the population dynamics of an ecosystem?

• Organisms that compete for the same prey will keep each other from over populating

• A parasite that invades a host can reproduce and cause a decline in the host species population

• Seasonal variations in temperature and precipitation can cause some of the individuals in a population to die

• Herbivores will not be able to deplete the plants and other resources in an ecosystem due to predation

The small foot rabbit is the primary food source for the Wild Dog. What would happen to the rabbit population if the Wild Dog population significantly decreases in size?

• The population of rabbits would increase forever

• The population would decrease forever

• The population would increase until stabilization occurs

• The population would decrease until stabilization occurs

At about what number is the population's carrying capacity

• 1850 Million

• 1.5 Million

• 1.0 Million

• 1875 Million

The number of iguanas found throughout the Florida Keys has increased in recent years. These large reptiles are not native to Florida and are believed to have arrived by ships carrying fruits and other goods from South America. Wildlife biologists have initiated attempts to capture and remove these iguanas. Which statement best explains the biologists' reasons for removing these iguanas from the Keys?

• The iguanas could upset the climate of the ecosystem

• The iguanas could adapt to overcome diseases common to native reptiles

• The iguanas could prey on native organisms and cause native population to decline

• The iguanas could begin to interbreed with native reptiles and produce a more successful species

What type of graph is shown

• Boom Curve

• Quadratic Curve

• Exponential Curve

• Predator-Prey Cycle

How is change in population calculated?

• immigration plus births - emigration plus deaths = change in population

• births -  deaths = change in population

• immigration - emigration = change in population

• migration plus deaths - immigration plus births = change in population

Which of the following are density independent limiting factors?

• temperature, storms, habitat destruction, drought

• lack of food, competition, space

• heat, food, flooding, lack of water

• shelter availability, space, food, water

An Oxpecker bird helps to clean off parasites off of an ox. The bird gets food and in return the ox is safe from diseases. What type of relationship is between the oxpecker and ox?

• Commensalism

• Mutualism

• Parasitism

• Predation