Question 1

Which of the following best describes the difference between biotic and abiotic factors in an ecosystem?

Accepted Answer

Biotic factors are living components such as plants and animals, while abiotic factors are non-living attributes like temperature and water.

Question 2

A population of wildebeest (as shown in the first image) is observed to be aggregated in patches near water sources. Which dispersion pattern does this represent, and what is a likely cause?

Accepted Answer

Clumped dispersion; caused by resource availability.

Question 3

Which level of ecological organization includes all the living organisms in an area and the non-living components with which they interact?

Accepted Answer

Ecosystem

Question 4

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

Accepted Answer

A disease spreading more rapidly as population density increases

Question 5

The equation for the growth rate of a local population is given by $$r = (b - d) + (i - e). $$What does each variable represent?

Accepted Answer

$$b = $$births, $$d = $$deaths, $$i = $$immigration, $$e = $$emigration

Question 6

Which survivorship curve is characterized by high survivorship in early and middle life, followed by a steep decline in older age groups?

Accepted Answer

Type I

Question 7

A population of frogs experiences a sudden cold snap that kills many individuals regardless of population size. This is an example of:

Accepted Answer

Density-independent regulation

Question 8

Which biome is most likely to be found at 30°N and 30°S latitude, and why?

Accepted Answer

Desert; due to descending dry air absorbing moisture

Question 9

Which of the following best explains why the Gulf Stream current leads to warmer temperatures in northwestern Europe?

Accepted Answer

It transports warm water from the tropics, warming the air masses that move over Europe.

Question 10

Which of the following is NOT a likely reason for the absence of a species in a particular area?

Accepted Answer

High genetic diversity

Question 11

A population of bacteria in a nutrient-rich medium doubles every hour. Which population growth model best describes this scenario?

Accepted Answer

Exponential growth

Question 12

Which of the following best describes the Coriolis effect and its impact on global wind patterns?

Accepted Answer

It results from Earth's rotation, causing winds to be deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.

Question 13

Which of the following is an example of a mutualistic interaction limiting species distribution?

Accepted Answer

A plant species cannot survive in an area without its pollinator.

Question 14

Which dispersion pattern is most likely to occur in a population where individuals are territorial and compete for resources?

Accepted Answer

Uniform

Question 15

If a population's carrying capacity is $$K = 500$$ and the current population size is $$N = 100$$, which statement about logistic growth is correct?

Accepted Answer

The population will grow rapidly because resources are abundant.

Question 16

Which of the following best explains why tundra biomes are found at high latitudes?

Accepted Answer

Low angle of incoming sunlight and cold, dry air

Question 17

Which survivorship curve is most likely for a species that produces many offspring but provides little or no parental care?

Accepted Answer

Type III

Question 18

Which of the following is a likely consequence of climate change on species distribution?

Accepted Answer

Species may shift their geographic ranges to track suitable climate conditions.

Question 19

Which of the following best describes the relationship between organism size and population density?

Accepted Answer

Population density is negatively correlated with body size.

Question 20

Which of the following is a characteristic of random dispersion in a population?

Accepted Answer

Individuals are distributed independently of each other, often where environmental conditions are constant.

Population Ecology and the Distribution of Organisms

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