Title: Unit 7 Quiz
Course: BIS 205 Field Ecology - Copy > Section: BIS 205 Field Ecology - Copy

Q: Two barnacle species, Chthamalus stellatus and Semibalanus balanoides, do not coexist in the same tidal zones because
- C. stellatus outcompetes S. balanoides in the lower tidal zone
- C. stellatus outcompetes S. balanoides in the upper tidal zone
- S. balanoides outcompetes C. stellatus in the upper tidal zone
- They have different niches.
- S. balanoides outcompetes C. stellatus in the lower tidal zone
A: S. balanoides outcompetes C. stellatus in the lower tidal zone

Q: Several individuals of a caterpillar species are all on a large leaf. Each eats as much of the leaf as they can. This is an example of
- interspecific competition
- interference competition
- allelopathy
- exploitative competition
- character displacement
A: exploitative competition

Q: What is the difference between competitive effect and competitive response?

Q: According to the competitive exclusion principle, two species cannot exist indefinitely if they
- exist in the same biome
- exist in the same ecosystem
- occupy the same niche
- occupy the same territory
- have the same range
A: occupy the same niche

Q: Which of the following statements is consistent with the principle of competitive exclusion?
- Wolves do not compete for dens.
- Natural selection tends to increase competition between related species.
- A species with a slight competitive advantage will result in the elimination of the less well adapted species.
- Two species with the same niche will exclude other competing species
- One competing species will have a positive impact on another species
A: A species with a slight competitive advantage will result in the elimination of the less well adapted species.

Q: Research on Darwin's finches from Daphne Major Island found
- Individuals with the deepest beak fed on the hardest seeds, while those with the smallest beaks fed on softer seeds.
- Individuals with the deepest beak fed on the softest seeds, while those with the smallest beaks fed on the hardest seeds.
- There was no correlation between beak size and the type of seeds they fed on.
- All individuals ate the largest seeds first, and then later ate the smaller seeds.
A: Individuals with the deepest beak fed on the hardest seeds, while those with the smallest beaks fed on softer seeds.

Q: Explain the similarities and differences between exploitation (resource) competition and interference competition.

Q: Gause's experiments on Paramecium showed that when grown alone, ______ for food determined the carrying capacity.
- interspecific competition
- priority effect
- intraspecific competition
- character displacement
- competitive exclusion
A: intraspecific competition

Q: The [_____] states the first species to establish a greater population generally wins the competition battle.
A: priority effect

Q: Interspecific competition that leads to two species differing more from each other where they occur together than they do in areas where they do not exist together is known as
- character displacement
- character evolution
- niche displacement
- niche evolution
- competitive exclusion
A: character displacement

Q: Intraspecific competition for limited resources can be a key factor in slowing population growth at high densities.
- True
- False
A: True

Q: If the isocline of species 1 lies above that of species 2,
- species 2 will eventually exclude species 1
- species 1 will eventually exclude species 2
- both species will coexist in a habitat
- the growth trajectories will lead to the point where N_2=K_2 and N_1=0
- species 1 will increase if they are sympatric with species 2, but decrease if they are allopatric
A: species 1 will eventually exclude species 2

Q: The term α<sub>21</sub> in the Lotka-Volterra competition model represents
- carrying capacity of species 1 with competition from species 2
- carrying capacity of species 2 with competition from species 1
- competitive effect of species 1 on the population growth rate of species 2
- competitive effect of species 2 on the population growth rate of species 1
- species 2 isocline of growth with species 1
A: competitive effect of species 1 on the population growth rate of species 2

Q: The Lotka-Volterra competition model predicts two species can coexist only when
- intraspecific competition is stronger than interspecific competition
- interspecific competition is stronger than intraspecific competition
- intraspecific competition and interspecific competition are equal
- never, two species can never coexist
A: intraspecific competition is stronger than interspecific competition

Q: Plants often undergo a process of self-thinning. This means
- biomass of an individual declines due to competition
- population density declines due to competition as biomass increases
- population density and biomass decline due to competition
- the total biomass of a population declines due to competiton
- herbivores reduce biomass and population density
A: population density declines due to competition as biomass increases

Q: In a given species, all individuals have identical niches.
- True
- False
A: False

Q: Two species inhabiting the same place are said to be
- allopatric
- precocial
- competitors
- sympatric
- self-thinning
A: sympatric

Q: Competition between two individuals of the same species is called [_____] competition.
A: intraspecific