Question 1

Which of the following best describes Darwin's concept of natural selection?

Accepted Answer

Individuals with traits better suited to their environment are more likely to survive and reproduce, passing those traits to the next generation.

Question 2

Which of the following is an example of a homologous structure?

Accepted Answer

The flipper of a whale and the human arm

Question 3

A population of beetles is separated by a river, and over time, the two groups evolve into distinct species. This is an example of:

Accepted Answer

Allopatric speciation

Question 4

Which process is responsible for the greatest source of genetic variation in sexually reproducing populations?

Accepted Answer

Sexual reproduction

Question 5

Which of the following best defines a gene pool?

Accepted Answer

All the alleles present in a population

Question 6

Which of the following is a postzygotic barrier to reproduction?

Accepted Answer

Hybrid offspring are sterile

Question 7

Which cellular process releases $$\mathrm{CO_2$}$$ into the atmosphere as part of the carbon cycle?

Accepted Answer

Cellular respiration

Question 8

Which of the following is a consequence of biological magnification?

Accepted Answer

Toxins such as mercury accumulate in greater concentrations in organisms higher up the food chain.

Question 9

Which of the following is NOT a reason why natural selection cannot produce perfect organisms?

Accepted Answer

Mutations always produce beneficial traits.

Question 10

In the context of antibiotic resistance, which statement is correct?

Accepted Answer

Bacteria are evolving resistance to antibiotics due to natural selection.

Question 11

Which of the following best describes mutualism?

Accepted Answer

Both species benefit from the interaction.

Question 12

Which event in Earth's history allowed mammals to diversify and occupy new ecological niches?

Accepted Answer

The mass extinction at the end of the Cretaceous period

Question 13

Which of the following is an example of coevolution?

Accepted Answer

A flower evolving a specific shape to match its pollinator, and the pollinator evolving a matching body part

Question 14

Which of the following is a primary greenhouse gas contributing to global warming?

Accepted Answer

Methane ($$\mathrm{CH_4$})$$

Question 15

If two species occupy the same ecological niche in the same habitat, what is the most likely outcome?

Accepted Answer

One species will outcompete the other, leading to competitive exclusion.

Question 16

Which of the following best describes the difference between microevolution and macroevolution?

Accepted Answer

Microevolution involves changes in allele frequencies within a population, while macroevolution involves the origin of new species and higher taxonomic groups.

Question 17

Which of the following is a prezygotic barrier to reproduction?

Accepted Answer

Mating occurs at different times of the year

Question 18

Which of the following best describes the role of primary producers in an ecosystem?

Accepted Answer

They convert inorganic molecules into organic molecules using energy from the sun.

Question 19

Which of the following is a likely effect of invasive species on a native community?

Accepted Answer

They can outcompete native species, leading to declines or extinctions.

Question 20

About what percentage of energy from primary producers is typically available to secondary consumers in an ecosystem?

Accepted Answer

$$1\%$$

Unit 4 Biology: Ecology & Evolution Study Guide – Step-by-Step Guidance

Study Guide - Practice Questions

Study Guide - Flashcards