Q: Which equation correctly represents the change in population size when considering births, deaths, immigration, and emigration?

$$\text{Change in population size} = \text{Births} + \text{Immigrants entering population} - \text{Deaths} - \text{Emigrants leaving population}$$

Question 1

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

Accepted Answer

A group of individuals of the same species living in the same area and interbreeding

Question 2

Which equation correctly represents the change in population size when considering births, deaths, immigration, and emigration?

Accepted Answer

$$	ext{Change in population size} = 	ext{Births} + 	ext{Immigrants entering population} - 	ext{Deaths} - 	ext{Emigrants leaving population}$$

Question 3

A population of elephants in Kruger National Park grew rapidly after hunting was banned, showing a J-shaped curve. Which growth model does this represent, and what is the equation for its rate of change?

Accepted Answer

Exponential growth; $$\frac{dN}{dt} = rN$$

Question 4

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

Accepted Answer

Increased competition for food as population density rises

Question 5

A population of water fleas (Daphnia) in a laboratory overshoots its carrying capacity before stabilizing. Which model best explains this pattern, and what is the equation for logistic growth?

Accepted Answer

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

Question 6

Which of the following best explains why temperature is a critical abiotic factor in determining the geographic distribution of organisms?

Accepted Answer

Temperature influences the rate of biological processes and can cause cell damage outside optimal ranges

Question 7

Which pattern of dispersion is most likely to be observed in penguins that nest on small islands and maintain territories through aggressive interactions?

Accepted Answer

Uniform

Question 8

A researcher observes that removing sea urchins from a rocky shore leads to a dramatic increase in seaweed cover. What does this experiment demonstrate?

Accepted Answer

Sea urchins are a biotic factor that limits seaweed distribution through herbivory

Question 9

Which survivorship curve (Type I, II, or III) best describes a species that produces many offspring, most of which die early in life, but those that survive live long lives (e.g., oysters)?

Accepted Answer

Type III

Question 10

Which of the following is a correct statement about carrying capacity ($$K) in $$the logistic growth model?

Accepted Answer

It is the maximum population size that can be supported indefinitely by the environment

Question 11

Which of the following scenarios best illustrates the effect of a physical abiotic factor limiting species distribution?

Accepted Answer

A plant species cannot survive in soils with low pH

Question 12

Which of the following best explains why the windward side of a mountain range is typically wetter than the leeward side?

Accepted Answer

Air rises, cools, and releases moisture as precipitation on the windward side

Question 13

A population of birds has the following life table data: 1000 hatchlings, 500 survive to age 1, and 100 survive to age 2. What is the proportion surviving from birth to age 2?

Accepted Answer

$$0.10$$

Question 14

Which of the following is an example of a density-independent factor affecting population size?

Accepted Answer

A hurricane destroying a coastal bird population

Question 15

Which of the following best describes the effect of global air circulation on precipitation patterns near the equator?

Accepted Answer

Ascending moist air releases moisture as rain, creating tropical forests

Question 16

Which of the following best explains why lake effect snow occurs near the Great Lakes?

Accepted Answer

Cold air passes over warm lake water, picking up moisture that falls as snow on the downwind shore

Question 17

Which of the following is NOT a likely reason for a species to be absent from a particular area, according to the flowchart of factors limiting geographic distribution?

Accepted Answer

The species has a high reproductive rate

Question 18

Which of the following best describes a clumped pattern of dispersion, and what is a likely cause?

Accepted Answer

Individuals aggregate in patches, often where resources are abundant

Question 19

If a population is growing according to the logistic model, what happens as the population size ($$N) $$approaches the carrying capacity ($$K$$)?

Accepted Answer

The growth rate decreases and approaches zero

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