Question 1

Which of the following best describes the Biological Species Concept (BSC)?

Accepted Answer

Species are defined by their ability to interbreed and produce viable, fertile offspring.

Question 2

A population of frogs is split by a newly formed river, preventing gene flow between the two groups. Over time, these populations diverge genetically and morphologically. What type of speciation is most likely occurring?

Accepted Answer

Allopatric speciation

Question 3

Which of the following is a postzygotic reproductive isolating mechanism?

Accepted Answer

Hybrid sterility

Question 4

Given the exponential growth equation $$N_t = N_0$ e$$^{rt}$$, which variable represents the intrinsic rate of increase?

Accepted Answer

$$r$$

Question 5

A population of deer in a forest is limited by food availability, which is a density-dependent factor. Which of the following best describes the effect of this factor as population size increases?

Accepted Answer

The effect of food limitation increases as population density increases.

Question 6

Which of the following scenarios best illustrates reinforcement in the context of speciation?

Accepted Answer

Two closely related species produce hybrids with reduced fitness, leading to increased prezygotic isolation.

Question 7

In a phylogenetic tree, a clade is defined as:

Accepted Answer

A group consisting of an ancestor and all its descendants.

Question 8

Which of the following is an example of convergent evolution?

Accepted Answer

Wings in bats and birds evolving independently for flight.

Question 9

Which equation best represents logistic population growth?

Accepted Answer

$$\frac{dN}{dt} = rN \left(1 - \frac{N}{K}\right)$$

Question 10

A keystone species is important in a community because:

Accepted Answer

Its removal causes a dramatic shift in community structure and diversity.

Question 11

Which of the following best describes a trophic cascade?

Accepted Answer

A change in the abundance of one species that indirectly affects multiple other species across different trophic levels.

Question 12

Which of the following is a biotic factor that can influence the distribution and abundance of a species?

Accepted Answer

Competition with other species

Question 13

According to the theory of island biogeography, which island would be expected to have the highest species richness?

Accepted Answer

A large island close to the mainland

Question 14

Which process is most responsible for the cycling of nutrients through both biotic and abiotic reservoirs in an ecosystem?

Accepted Answer

Biogeochemical cycles

Question 15

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

Accepted Answer

Much energy is lost as heat due to metabolic processes at each trophic level.

Question 16

Which of the following is an example of vicariance affecting species distribution?

Accepted Answer

A mountain range forms, splitting a population into two isolated groups.

Question 17

Which of the following is a correct statement about the realized niche of a species?

Accepted Answer

It is the actual set of environmental conditions in which a species exists, considering biotic interactions.

Question 18

Which of the following best describes primary succession?

Accepted Answer

The colonization of a barren habitat where no soil exists, such as after a volcanic eruption.

Question 19

Which equation would you use to estimate the number of individuals in a population after $$t$$ years, given an initial population $$N_0$$ and a constant rate of increase $$r$$?

Accepted Answer

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

Question 20

Which of the following is a plausible consequence of a mass extinction event?

Accepted Answer

Rapid diversification of surviving lineages due to available ecological niches.

General Biology: Evolution, Phylogenetics, and Ecology Study Guide

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