Biology Test 3

Think about the parameter that differs between density-independent and density-dependent growth.

A population that is experiencing density-dependent growth levels off at the environment's carrying capacity.

What processes increase a population's size?

Births and immigration. (Immigration is the movement of individuals into a population, so births and immigration increase a population's size.)

Which of the following statements about density-independent growth is true?

Density-independent growth is also known as exponential growth.

Which of the following statements about a population experiencing logistic growth is true?

If N is greater than K, the population will shrink. (This statement is true, since K is the maximum number of individuals that can be supported in a particular habitat over a sustained period of time.)

Which factor does not affect a habitat's carrying capacity?

Maximum number of individuals in a population. (The maximum number of individuals in a population that can be sustained in a habitat over a period of time is the carrying capacity of a habitat.)

True or false? Factors that determine the per capita rate of increase of a population include the age of breeding and the number of offspring produced each year.

True. (The per capita rate of increase of a population is the difference between the per capita birth rate and the per capita death rate, and is determined by factors that include the age of breeding and the number of offspring produced each year.)

Under which of the following conditions would a population most likely experience exponential growth?

Young populations with few individuals. (Young populations with few individuals are more likely to experience exponential growth because they have not used up the supply of resources.)

delta N/ delta t = rN

represents a populations growth rate under suboptimal conditions