Ecosystems: Stability and Change

Which of these abiotic factors would contribute to a clumped dispersion pattern in an ecosystem?

• Unlimited Water

• Limited Water

• High Temperatures

Tags

NGSS.MS-LS2-1

A population of antelope has a negative population growth rate. Which of these conditions must also be true fro the population growth rate to be negative?

• births+deaths< immigrations + emigrations

• births + deaths > immigration + emigrations

• births + immigrations < deaths + emigrations

• births + immigrations > deaths + emigrations

A population of warblers, a type of songbird, experiences a period of exponential growth. Which of these factors would be a density-dependent limiting factor that could decrease the carrying capacity of the ecosystem for this population of songbirds?

• a competing species moves into the forest

• a period of lower than normal rainfall

• a builder removes treees for an office park

• high winds knock down a quarter of the trees

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

A population of deer is displaced by a massive flood in thier habitat following a severe rainstorm. The flood is a example of

• a density-dependent limiting factor

• carrying capacity

• a density-independent limiting factor

• survivorship

Tags

NGSS.MS-LS2-4

A population of rodents is introduced on a remote island due to shipwreck. Eventually, the population reaches the island's carrying capacity. At this point, the birth and death rates are

• relatively equally

• crashing

• density independent

• density dependent

Tags

NGSS.MS-LS2-4

A female salamander lays hundreds of eggs at a time. However, after hatching, few of the larvae survive to adulthood. According to the graph, which type of survivorship does the salamander exhibit?

• Type I

• Type II

• Type III

A songbird has an equal chance of surviving at all stages of its life. According to the graph, which type of survivorship does the songbird exhibit?

• Type I

• Type II

• Type III

Over the course of a year, a population of 25 penguins gained 5 penguins through births and lost 3 penguins to death. In addition, 10 adult penguins moved into the population through immigration and 6 adult penguins moved out of the population through emigration. What is the yearly growth rate of this population?

• 19

• -8

• -2

• 6

Tags

NGSS.MS-LS2-1

Which type of interaction is most responsible for energy transfer in a food chain?

• competition

• mutualism

• parasitism

• predation

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

What is the relationship between population number and carrying capacity in a stable population?

• The population number matches the carrying capacity exactly through births, deaths, immigrations, and emigrations.

• The population number oscillates around the carrying capacity as resources and population growth rates change slightly over time.

• The carrying capacity and population number increase when resources are scarce and decrease when resources are abundant.

• Carrying capacity and population numbers are inversely proportional. An increase in carrying capacity will be accompanied by a decrease in population numbers.