Question 1

Which of the following best distinguishes semelparity from iteroparity in life history strategies?

Accepted Answer

Semelparity involves a single reproductive event followed by death, while iteroparity involves multiple reproductive cycles throughout life.

Question 2

Which environmental condition is most likely to favor the evolution of semelparity?

Accepted Answer

Highly unpredictable environments where offspring survival is low and reproduction is risky.

Question 3

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

Accepted Answer

Producing many small offspring versus few large offspring.

Question 4

A species that produces many offspring, matures quickly, and has little parental care is most likely to exhibit which type of life history strategy?

Accepted Answer

r-selection

Question 5

Which of the following best characterizes a K-selected species?

Accepted Answer

Long lifespan, high parental investment, and stable population size near carrying capacity.

Question 6

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

Accepted Answer

Competition for food resources increases as population size increases.

Question 7

How do density-independent factors differ from density-dependent factors in regulating population growth?

Accepted Answer

Density-independent factors affect populations regardless of their size, while density-dependent factors have effects that increase with population density.

Question 8

Which scenario best illustrates the effect of weather as a density-independent factor?

Accepted Answer

A drought reduces the population of a species regardless of how many individuals are present.

Question 9

In a classic predator-prey relationship, such as lynx and hare, what typically happens to the predator population after the prey population increases?

Accepted Answer

The predator population increases after a time lag, following the rise in prey population.

Question 10

Which of the following best describes the pattern of human population growth over the past 500 years?

Accepted Answer

Exponential growth, especially after the Industrial Revolution.

Question 11

Which event contributed most significantly to the rapid increase in human population size in the last two centuries?

Accepted Answer

The Industrial Revolution, which improved food production and healthcare.

Question 12

Which of the following is a current hypothesis about Earth's carrying capacity for humans?

Accepted Answer

It depends on resource consumption rates and technological advances.

Question 13

Which formula can be used to estimate the ecological footprint of a nation?

Accepted Answer

$$EF = \frac{Total\,Resource\,Consumption}{Biologically\,Productive\,Land\,and\,Water\,Area}$$

Question 14

Why is the ecological footprint generally higher in developed nations compared to developing nations?

Accepted Answer

Developed nations have higher per capita resource consumption and waste production.

Question 15

A population of rabbits is limited by food availability, which becomes scarcer as the population grows. What type of population regulation is this?

Accepted Answer

Density-dependent regulation

Question 16

If a population is growing according to the logistic growth model, which equation describes its growth rate?

Accepted Answer

$$\frac{dN}{dt} = rN \left(1 - \frac{N}{K}\right)$$

Question 17

Which of the following is NOT a likely trade-off in life history strategies?

Accepted Answer

High mutation rate versus high genetic stability

Question 18

Which of the following best explains why predator and prey populations often cycle in nature?

Accepted Answer

Predator populations increase after prey populations rise, but as predators consume more prey, prey numbers fall, leading to a subsequent decline in predators.

Question 19

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

Accepted Answer

A severe frost kills a large proportion of a plant population regardless of its density.

Question 20

If a country has a high ecological footprint but a small population, what does this suggest about its per capita resource use?

Accepted Answer

Per capita resource use is high.

Population Ecology and Life History Strategies Study Guide

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