Question 1

Which of the following best describes the difference between a description and an explanation in scientific analysis?

Accepted Answer

A description states what a pattern looks like, while an explanation provides the reason why the pattern exists.

Question 2

In population ecology, which equation correctly represents the rate of increase ($$r) in a $$population where immigration and emigration are negligible?

Accepted Answer

$$r = b - d$$

Question 3

A population of birds is introduced to a new, uninhabited island with abundant resources and no predators. Which type of population growth is most likely to occur initially?

Accepted Answer

Exponential growth, because resources are abundant and threats are minimal.

Question 4

Which of the following is NOT a parameter that directly affects population size in population ecology?

Accepted Answer

Coloration of individuals

Question 5

Given the equation for population growth $$\Delta N = N 	imes r$$, if a population of 100 individuals has a rate of increase $$r = 0.05$$, what is the change in population size ($$\Delta N) $$after one time unit?

Accepted Answer

$$\Delta N = 5$$

Question 6

Which life-history trait is most likely associated with a species that has a high intrinsic rate of increase ($$r_{max}$$)?

Accepted Answer

Small body size and early maturity

Question 7

What is the carrying capacity ($$K) in $$population ecology?

Accepted Answer

The maximum number of individuals that can be supported in a particular habitat over a period of time.

Question 8

Which scenario best illustrates density-independent population growth?

Accepted Answer

Bacteria growing in a flask with unlimited nutrients.

Question 9

During which stage of logistic growth does competition for resources begin to affect the population growth rate?

Accepted Answer

Middle stage, as population density increases

Question 10

If a population's birth rate equals its death rate and there is no migration, what is the value of $$r$$ and what does this mean for the population size?

Accepted Answer

$$r = 0$$; population size is stable

Question 11

Which of the following trade-offs is most likely in a species with high fecundity?

Accepted Answer

Small offspring and early maturity

Question 12

A population of 500 individuals has a birth rate of 0.04 and a death rate of 0.02 per year. What is the expected change in population size after one year, assuming no migration?

Accepted Answer

Increase by 20 individuals

Question 13

Which factor is most likely to cause the carrying capacity ($$K) of a $$habitat to vary over time?

Accepted Answer

Seasonal changes in resource availability

Question 14

Which of the following best describes the shape of a logistic growth curve?

Accepted Answer

S-shaped

Question 15

If a population is experiencing density-dependent growth, what happens to the growth rate as the population approaches carrying capacity?

Accepted Answer

Growth rate decreases

Question 16

Which of the following is a real-world example of exponential growth?

Accepted Answer

Bacteria introduced into a nutrient-rich laboratory flask

Question 17

What is the primary reason that trade-offs occur in life-history strategies?

Accepted Answer

Resources are limited and must be allocated between growth, reproduction, and survival

Question 18

Which population parameter is most directly affected by emigration?

Accepted Answer

Population size

Question 19

A population of rabbits in a meadow has reached its carrying capacity. What is most likely to happen if a new food source is introduced?

Accepted Answer

Carrying capacity will increase, allowing the population to grow further.

Question 20

Which of the following best explains why population growth is often modeled in three distinct stages?

Accepted Answer

To account for changes in birth and death rates, population density, and resource availability over time.

Population Ecology: Growth, Regulation, and Life History Strategies

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