Question 1

Which of the following best describes the difference between species richness and species evenness in measuring biodiversity?

Accepted Answer

Species richness measures the total number of species in a given area, while species evenness measures the relative abundance of each species.

Question 2

A biologist is studying two forest plots. Plot A has 10 species, each with roughly equal numbers of individuals. Plot B has 10 species, but one species makes up 90% of the individuals. Which plot has higher species evenness, and why?

Accepted Answer

Plot A, because the individuals are more evenly distributed among species.

Question 3

Which of the following is an example of an adaptive radiation?

Accepted Answer

The rapid diversification of flowering plants after the evolution of flowers, allowing them to exploit new pollinators and habitats.

Question 4

Which event is most likely to create ecological opportunity, leading to increased biodiversity through adaptive radiation?

Accepted Answer

A mass extinction that removes many competing species.

Question 5

Which of the following best defines a fundamental niche?

Accepted Answer

The full set of environmental conditions and resources a species could theoretically use in the absence of competition.

Question 6

A small population of frogs is isolated in a fragmented habitat. Which of the following is a likely consequence for this population?

Accepted Answer

Decreased genetic variation and increased risk of inbreeding depression.

Question 7

Which of the following is NOT a direct human impact contributing to current high extinction rates?

Accepted Answer

Natural selection

Question 8

Which of the following best explains why mass extinctions are often followed by bursts of speciation?

Accepted Answer

Mass extinctions create open ecological niches, allowing surviving species to diversify and adapt to new opportunities.

Question 9

Which of the following is a key characteristic that distinguishes animals from fungi?

Accepted Answer

Animals ingest and digest food internally, while fungi absorb nutrients after external digestion.

Question 10

Which of the following best describes phylogenetic diversity?

Accepted Answer

The amount of evolutionary history represented in a community, often measured as the sum of branch lengths on a phylogenetic tree.

Question 11

A conservation biologist wants to maximize genetic variation in a captive breeding program. Which strategy would be most effective?

Accepted Answer

Introducing individuals from different populations to promote gene flow.

Question 12

Which of the following is an example of a functional trait used to measure functional diversity in a community?

Accepted Answer

Leaf size in plants, which affects photosynthetic capacity.

Question 13

Which of the following equations correctly represents the calculation for species evenness using the Shannon diversity index $$H'$$ and the maximum possible diversity $$H'_{max}$$?

Accepted Answer

$$E = \frac{H'}{H'_{max}}$$

Question 14

Which of the following scenarios best illustrates the concept of a realized niche?

Accepted Answer

A plant species that can grow in both sunny and shady areas, but is found only in shady areas due to competition.

Question 15

Which of the following is a likely outcome of habitat fragmentation for a population of large mammals?

Accepted Answer

Reduced population size and increased vulnerability to extinction vortex.

Question 16

Which of the following is a correct sequence of major evolutionary events in the history of life on Earth?

Accepted Answer

Origin of life, first eukaryotes, first multicellular organisms, land plants, land vertebrates, mammals, flowering plants

Question 17

Which of the following best describes the extinction vortex?

Accepted Answer

A process where small populations become increasingly vulnerable to extinction due to genetic, demographic, and environmental factors.

Question 18

Which of the following conservation strategies is most likely to reduce inbreeding depression in a small, isolated population?

Accepted Answer

Introducing individuals from other populations to increase gene flow.

Question 19

Which of the following statements about biodiversity is most accurate?

Accepted Answer

Biodiversity is shaped by both evolutionary and ecological processes, and can increase or decrease depending on environmental changes.

Question 20

Which of the following is a plausible reason why smaller populations are more vulnerable to extinction?

Accepted Answer

They have reduced genetic diversity, making them less able to adapt to environmental changes.

Biodiversity, Evolutionary Patterns, and Conservation Biology

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