Population Biology and Competition Review 22-23

One biotic factor that limits the carrying capacity of any habitat is the

• Amount of soil erosion

• Activity of decomposers

• level of atmospheric oxygen

• availability of water

One factor that could result in an increase in the population size after year 10 would be

• increased competition within the species

• additional food became available

• predators of the species became more numerous

• a new parasite negatively affected reproduction in the species

Which statement best describes the process of competition?

• It may be for abiotic or biotic resources.

• It is not affected by changes in the environment.

• It always occurs between members of different species.

• It allows nutrients in an ecosystem to move from herbivores to autotrophs.

Which statement best illustrates direct competition within a species?

• A chipmunk is caught and eaten by a hungry fox.

• A deer attempts to escape a mountain lion that is chasing it.

• Two muskrats mate and produce a litter of offspring.

• Several squirrels eat acorns from the oak tree where they live.

The size of a frog population in a pond remains fairly constant over a period of several years because of

• the depth of the water

• excessive dissolved oxygen

• decreasing competition

• environmental carrying capacity

On which day did the population reach the carrying capacity?

• Day 3

• Day 5

• Day 8

• Day 11

The graph represents a fish population. What does A represent?

• nutritional relationships of the species

• a population becoming extinct

• a population at equilibrium

• biodiversity within a species

Which statement best describes the fruit fly population in the part of the curve labeled X ?

• The fruit fly population is no longer able to adapt to the changing environmental conditions

• The fruit fly population can no longer mate and produce fertile offspring

• The fruit fly population has an average life span of 36 days.

• The fruit fly population has reached the number of organisms the habitat can support

Which letter indicates the carrying capacity for this population?

• Letter A

• Letter B

• Letter C

• Letter D

What impact do the amounts of available energy, water, and oxygen have on an ecosystem?

• They control environmental temperature

• They act as limiting factors

• They recycle the residue of dead organisms

• They are used as nutrients