Question 1

Which of the following best describes the difference between taxonomy and systematics?

Accepted Answer

Taxonomy is the identification, naming, and classification of species, while systematics also considers evolutionary relationships among organisms.

Question 2

A scientist is constructing a phylogenetic tree using DNA sequence data. Which of the following statements is correct regarding the use of homology and analogy in this process?

Accepted Answer

Homologous traits are used because they reflect shared ancestry, while analogous traits are avoided because they result from convergent evolution.

Question 3

Which of the following is an example of a monophyletic group?

Accepted Answer

A group that includes all descendants of a common ancestor and that ancestor.

Question 4

Which equation correctly represents the exponential growth of a population?

Accepted Answer

$$dN/dt = rN$$

Question 5

A population of rabbits in a field grows rapidly at first, then levels off as resources become limited. Which model best describes this population growth?

Accepted Answer

Logistic growth model

Question 6

Which of the following is a density-dependent factor that can regulate population size?

Accepted Answer

A contagious disease spreading more rapidly as population density increases

Question 7

In a food web, which of the following best describes the role of a primary consumer?

Accepted Answer

An organism that eats primary producers (plants or algae)

Question 8

Which of the following interactions is an example of mutualism?

Accepted Answer

Bees pollinating flowers while obtaining nectar

Question 9

Which of the following best explains why energy transfer between trophic levels is inefficient?

Accepted Answer

Most energy is lost as heat due to metabolic processes, and only a small fraction is stored as biomass.

Question 10

A scientist observes that a certain plant species only grows in areas where a specific fungus is present. Which ecological interaction is most likely occurring?

Accepted Answer

Mutualism

Question 11

Which of the following best describes the competitive exclusion principle?

Accepted Answer

Two species with identical niches cannot coexist indefinitely in the same habitat.

Question 12

Which of the following is an example of a boom-and-bust population cycle?

Accepted Answer

A population of lemmings rapidly increases and then crashes due to food shortage.

Question 13

Which of the following is a correct statement about the use of molecular data in constructing phylogenetic trees?

Accepted Answer

Molecular data can reveal evolutionary relationships not evident from morphology alone.

Question 14

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

Accepted Answer

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

Question 15

Which of the following best describes the effect of keystone species on community diversity?

Accepted Answer

Keystone species increase community diversity by maintaining the structure of the ecosystem.

Question 16

Which of the following is an example of an adaptation resulting from community dynamics?

Accepted Answer

A plant developing toxins to deter herbivores

Question 17

Which of the following best describes the flow of energy in an ecosystem?

Accepted Answer

Energy flows in one direction, from producers to consumers to decomposers, with some lost as heat at each step.

Question 18

Which of the following best explains why only about 10% of chemical energy is transferred from one trophic level to the next?

Accepted Answer

Most energy is used for metabolic processes or lost as heat.

Question 19

Which of the following is an example of parasitism?

Accepted Answer

A tapeworm living in the intestines of a mammal

Question 20

Which of the following best describes the relationship between a predator and its prey?

Accepted Answer

The predator benefits while the prey is harmed.

General Biology Study Guide: Evolutionary History, Population Ecology, and Community Ecology

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