Q: If 25% of amphibian species are threatened and 10% are critically endangered, what percent of threatened amphibians are critically endangered? Use the formula $$ \text{Percent} = \frac{\text{Part}}{\text{Whole}} \times 100 .$$

$$ \frac{10}{25} \times 100 = 40\% $$

Question 1

Which of the following best describes the difference between habitat destruction and habitat degradation?

Accepted Answer

Habitat destruction refers to the complete elimination of a habitat, while habitat degradation refers to a decline in habitat quality that does not necessarily eliminate the habitat.

Question 2

A scientist is analyzing the effect of pollution on amphibian populations. She sets up an experiment with different concentrations of a pollutant and measures the number of surviving tadpoles. Which variable should be plotted on the x-axis of her graph?

Accepted Answer

Concentration of pollutant

Question 3

According to global trends, where is biodiversity generally highest?

Accepted Answer

Near the equator, in tropical regions

Question 4

Which of the following is NOT a major threat to biodiversity as identified in conservation biology?

Accepted Answer

Increased pollinator diversity

Question 5

A bar chart is most appropriate for which type of data?

Accepted Answer

Comparing the number of endangered species in different countries

Question 6

If 25% of amphibian species are threatened and 10% are critically endangered, what percent of threatened amphibians are critically endangered? Use the formula $$ 	ext{Percent} = \frac{	ext{Part}}{	ext{Whole}} 	imes 100 .$$

Accepted Answer

$$ \frac{10}{25} 	imes 100 = 40\% $$

Question 7

Which of the following best defines 'species richness'?

Accepted Answer

The number of different species present in a given area

Question 8

Which ecosystem service is provided when trees in a forest remove carbon dioxide from the atmosphere?

Accepted Answer

Regulating service

Question 9

A conservation biologist wants to test the hypothesis that increasing plant species richness increases total plant biomass. Which of the following would be the best null hypothesis for this experiment?

Accepted Answer

There is no relationship between plant species richness and total plant biomass.

Question 10

Which of the following is an example of an ethical argument for conserving biodiversity?

Accepted Answer

All species have an intrinsic right to exist, regardless of their utility to humans.

Question 11

If a graph shows a positive linear relationship between species richness (x-axis) and plant biomass (y-axis), which equation best represents this relationship?

Accepted Answer

$$ y = mx + b $$ where $$ m \u003e 0 $$

Question 12

Which of the following best describes the concept of 'resilience' in an ecosystem?

Accepted Answer

The ability of an ecosystem to recover after a disturbance

Question 13

Which of the following is a real-world example of an invasive species threatening biodiversity?

Accepted Answer

The introduction of zebra mussels into North American lakes

Question 14

A student is comparing the threats to freshwater, terrestrial, and marine vertebrates. According to conservation data, which group is generally most threatened by habitat loss?

Accepted Answer

Freshwater vertebrates

Question 15

Which of the following is an example of a provisioning ecosystem service?

Accepted Answer

Harvesting timber for construction

Question 16

A scientist predicts that if current extinction rates continue, 20% of all mammal species will be extinct in 100 years. Which process is she using to make this prediction?

Accepted Answer

Extrapolation from current data

Question 17

Which conservation strategy is most likely to be effective for protecting a species with a very small, isolated population?

Accepted Answer

Establishing a wildlife corridor to connect isolated habitats

Question 18

Which of the following best describes the human niche, and how it is expected to change over the next 50 years?

Accepted Answer

The human niche is expanding due to increased resource use and technological advances, leading to greater impacts on global ecosystems.

Question 19

Which of the following is a correct statement about the relationship between species richness and ecosystem resistance?

Accepted Answer

Ecosystems with higher species richness tend to be more resistant to disturbances.

Question 20

Which of the following is an example of a supporting ecosystem service?

Accepted Answer

Soil formation by decomposers

Biodiversity and Conservation: Study Guide and Key Concepts

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