Question 1

Which of the following best describes the difference between a population and a community in ecological studies?

Accepted Answer

A population is a group of individuals of the same species living in the same area, while a community consists of populations of different species interacting in the same area.

Question 2

Which equation correctly represents the exponential growth rate of a population?

Accepted Answer

$$\frac{dN}{dt} = rN$$

Question 3

A population of deer in a forest increases due to births and immigration, but decreases due to deaths and emigration. Which of the following best describes the factors that determine the change in population size?

Accepted Answer

Births, deaths, immigration, and emigration all affect population size.

Question 4

Which of the following scenarios would most likely result in exponential population growth?

Accepted Answer

A population of bacteria colonizing a new nutrient-rich petri dish.

Question 5

What does the term 'carrying capacity' ($$K) $$refer to in population ecology?

Accepted Answer

The maximum number of individuals that a particular habitat can support over a sustained period of time.

Question 6

Which of the following factors is considered density-independent and can affect population growth regardless of population size?

Accepted Answer

Flooding

Question 7

A population of reindeer on an island overshoots its carrying capacity and then collapses. What is the most likely cause of this population crash?

Accepted Answer

Over-foraging of the food supply leading to resource depletion

Question 8

Which equation describes logistic population growth, where growth slows as the population approaches carrying capacity?

Accepted Answer

$$\frac{dN}{dt} = rN \left( \frac{K-N}{K} \right)$$

Question 9

Which of the following best explains why different species have different intrinsic rates of increase ($$r_{max}$$)?

Accepted Answer

Because species have different life-history strategies and adaptations affecting their birth and death rates.

Question 10

Which survivorship curve would you expect for a species that produces many offspring, most of which die young, but a few survive to adulthood?

Accepted Answer

Type III

Question 11

If a population's birth rate ($$b) is $$less than its death rate ($$d$$), what will happen to the population growth rate ($$r$$)?

Accepted Answer

$$r$$ will be negative and the population will decline.

Question 12

Which of the following is an example of a density-dependent factor affecting population growth?

Accepted Answer

Competition for resources

Question 13

A population of rabbits has the same population size in two different areas, but the area sizes are different. What does this imply about population density?

Accepted Answer

Population density is higher in the smaller area.

Question 14

Which of the following best describes a fitness trade-off in life-history strategies?

Accepted Answer

An individual must allocate limited time, energy, and resources between survival and reproduction, often compromising one for the other.

Question 15

Which of the following is NOT a level of ecological study?

Accepted Answer

Molecular

Question 16

Why might the carrying capacity ($$K) of a $$habitat vary over time and space?

Accepted Answer

Because abiotic and biotic factors such as resource availability and competition can change.

Question 17

Which of the following statements about biodiversity is correct?

Accepted Answer

Biodiversity includes genetic diversity, species diversity, and ecosystem diversity.

Question 18

Which of the following would most likely cause a population to shift from exponential to logistic growth?

Accepted Answer

Increasing population density leading to competition for limited resources.

Question 19

In the logistic growth equation $$\frac{dN}{dt} = rN \left( \frac{K-N}{K} \right)$$, what does the term $$\frac{K-N}{K}$$ represent?

Accepted Answer

The proportion of unused resources in the habitat.

Question 20

Which of the following is a real-world example of density-independent population regulation?

Accepted Answer

A wildfire reducing population size regardless of initial density.

Population Ecology: Scales, Biodiversity, and Levels of Ecological Study

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