Question 1

Which of the following best describes the difference between exponential and logistic population growth models?

Accepted Answer

Exponential growth assumes unlimited resources, while logistic growth incorporates carrying capacity ($$K) to $$limit growth.

Question 2

A population of rabbits in a field is growing according to the logistic model. If the carrying capacity ($$K) is 500 $$and the current population ($$N) is 250$$, which equation correctly represents the rate of change in population size ($$\Delta N/\Delta t$$)?

Accepted Answer

$$\Delta N/\Delta t = rN \left( \frac{K-N}{K} \right)$$

Question 3

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

Accepted Answer

Competition for food resources

Question 4

A scientist observes that a population of deer has reached a stable size over several years. Which term best describes this phenomenon?

Accepted Answer

Carrying capacity

Question 5

Which equation would you use to calculate the per capita growth rate ($$r) of a $$population?

Accepted Answer

$$r = b - d$$

Question 6

Which of the following scenarios best illustrates the concept of competitive exclusion?

Accepted Answer

Two species of barnacles compete for the same space on a rocky shore, and one species eventually eliminates the other.

Question 7

Which of the following is NOT a factor that influences the growth of a population?

Accepted Answer

Coloration of individuals

Question 8

A population of bacteria doubles every hour. If you start with 100 bacteria, how many will you have after 5 hours?

Accepted Answer

Question 9

Which of the following best describes a keystone species?

Accepted Answer

A species that has a disproportionately large effect on its ecosystem relative to its abundance.

Question 10

Which formula is used to calculate species diversity using the Shannon diversity index ($$H'$$)?

Accepted Answer

$$H' = -\sum p_i \log p_i$$

Question 11

Which of the following is an example of a mutualistic relationship?

Accepted Answer

Bees pollinating flowers while obtaining nectar

Question 12

Which process is most likely to increase genetic diversity in a population?

Accepted Answer

Gene flow

Question 13

Which of the following best explains why invasive species often disrupt ecosystem dynamics?

Accepted Answer

They often lack natural predators and outcompete native species for resources.

Question 14

Which of the following is a direct effect of human activities on ecosystem structure and dynamics?

Accepted Answer

Deforestation leading to habitat loss

Question 15

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

Accepted Answer

$$N_t = N_0$ e$$^{rt}$$

Question 16

Which of the following is an abiotic factor that can influence population size?

Accepted Answer

Temperature

Question 17

Which of the following best describes the effect of a population bottleneck?

Accepted Answer

It reduces genetic diversity due to a drastic reduction in population size.

Question 18

Which of the following is a likely consequence of climate change on ecosystem structure?

Accepted Answer

Altered species distributions and changes in community composition

Question 19

Which of the following best explains the role of disturbance in ecological succession?

Accepted Answer

Disturbance can reset succession, allowing new species to colonize and alter community structure.

Ecology: Population, Community, and Ecosystem Dynamics

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