Question 1

Which of the following best describes a population in biological terms?

Accepted Answer

A group of individuals of a single species living in the same general area

Question 2

A researcher wants to estimate the population size of a bird species in a forest. Which method would be most appropriate if the birds are highly mobile and difficult to count directly?

Accepted Answer

Counting the number of nests and using it as an indicator

Question 3

Which pattern of dispersion is most likely to result from territorial behavior in animals?

Accepted Answer

Uniform

Question 4

Which of the following is a density-dependent factor that can regulate population growth?

Accepted Answer

A disease that spreads more easily in crowded populations

Question 5

A population of elephants in a national park grows rapidly after hunting is banned. Which model best describes this initial growth phase?

Accepted Answer

Exponential growth model

Question 6

Given the logistic growth equation $$dN/dt = rN \left( \frac{K-N}{K} \right)$$, what happens to the population growth rate as $$N$$ approaches $$K$$?

Accepted Answer

It decreases and approaches zero

Question 7

Which survivorship curve (Type I, II, or III) is characterized by high mortality in early life but high survival for those who reach adulthood?

Accepted Answer

Type III

Question 8

A plant species produces thousands of tiny seeds, most of which do not survive. Which life history strategy does this represent?

Accepted Answer

r-selection

Question 9

Which of the following is an example of a trade-off in life history strategies?

Accepted Answer

Producing many offspring but providing little care to each

Question 10

If a population’s birth rate does not change with density, but its death rate increases as density increases, what type of regulation is this?

Accepted Answer

Density-dependent regulation

Question 11

Which of the following best explains why populations rarely grow exponentially for long periods in nature?

Accepted Answer

Resources become limiting as population size increases

Question 12

A population of mice is studied over several years. Researchers notice that as the population grows, the average age at first reproduction increases and immune function decreases. What is the most likely explanation?

Accepted Answer

Intrinsic physiological factors are regulating population size

Question 13

Which of the following equations correctly represents the exponential growth of a population?

Accepted Answer

$$dN/dt = rN$$

Question 14

Which of the following scenarios would most likely result in a clumped dispersion pattern?

Accepted Answer

Starfish aggregating in areas with abundant food

Question 15

A population of yeast in a laboratory flask stops growing after reaching a certain density due to the accumulation of ethanol. This is an example of which regulatory mechanism?

Accepted Answer

Toxic waste accumulation

Question 16

Which of the following is NOT a mechanism of density-dependent population regulation?

Accepted Answer

Natural disasters

Question 17

In the context of population ecology, what does the term 'carrying capacity' ($$K) $$refer to?

Accepted Answer

The maximum population size that a particular environment can sustain

Question 18

Which reproductive strategy is characterized by a single, large reproductive event followed by death?

Accepted Answer

Semelparity

Question 19

Farmers often apply fertilizers to their fields to increase crop yield. Which population regulation mechanism are they attempting to overcome?

Accepted Answer

Competition for resources

Question 20

Which of the following best describes the effect of density-independent factors on population size?

Accepted Answer

They cause population size to fluctuate regardless of density

Population Ecology: Factors Affecting Population Size and Dynamics

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