Ecology Population Growth Models 3

Question 1

Which type of survivorship curve is characterized by high survival throughout life followed by rapid die-off in old age?

Accepted Answer

Type I

Answer

Type II

Answer

Type III

Answer

Type IV

Question 2

A population modeled with discrete time steps uses the geometric growth equation N(t+1) = λN(t). When is this population declining?

Accepted Answer

λ < 1

Answer

λ > 1

Answer

λ = 1

Answer

λ = 0.5 only

Question 3

Stochastic models of population growth are most important for predicting extinction risk in:

Accepted Answer

Very small populations where chance events matter greatly

Answer

Large stable populations near carrying capacity

Answer

Populations with very high intrinsic growth rates

Answer

Populations in highly productive environments

Question 4

The net reproductive rate R₀ = 1 means a population is:

Accepted Answer

Exactly replacing itself each generation

Answer

Growing exponentially

Answer

Declining toward extinction

Answer

At carrying capacity

Question 5

Which of the following is a density-independent factor affecting population growth?

Accepted Answer

A sudden volcanic eruption

Answer

Competition for food

Answer

Predation pressure

Answer

Disease transmission rate

Question 6

In the logistic model, negative feedback on growth becomes strongest when:

Accepted Answer

N approaches K

Answer

N is much smaller than K

Answer

N equals K/2

Answer

r approaches zero

Question 7

A population ecologist calculates r = 0.3/year for a species. This value represents:

Accepted Answer

The per capita rate of increase under current conditions

Answer

The number of offspring produced per individual per year

Answer

The carrying capacity divided by population size

Answer

The probability of survival to reproductive age