ENVS 1126 LSU EXAM 2 STUDY GUIDE 2025/2026
ACCURATE QUESTIONS AND VERIFIED CORRECT
SOLUTIONS WITH RATIONALES || 100%
GUARANTEED PASS <LATEST VERSION>
Population Ecology
1. What is a population's carrying capacity (K)?
A) The maximum population size that a particular environment can sustain indefinitely.
B) The maximum rate of population growth.
C) The initial size of a population when it first colonizes an area.
D) The number of individuals that die each year.
A) The maximum population size that a particular environment can sustain indefinitely.
2. Which type of species is most likely to be an r-strategist?
A) Elephant
B) Blue Whale
C) Dandelion
D) Oak Tree
C) Dandelion - R-strategists are species that have high reproductive rates, short lifespans,
and little parental care, typical of many weeds and insects.
3. A population with an age structure diagram that has a wide base (many young individuals)
is likely to:
A) Experience slow growth or decline
B) Experience rapid growth
C) Have reached its carrying capacity
D) Be dominated by post-reproductive individuals
B) Experience rapid growth - A wide base indicates a high proportion of young people who
will soon enter their reproductive years.
4. The formula for calculating population growth rate, (Births - Deaths) / Total Population,
gives you the:
A) Total growth
B) Exponential growth
,C) Per capita growth rate
D) Carrying capacity
C) Per capita growth rate
5. Density-dependent factors that limit population growth include:
A) Hurricanes
B) Wildfires
C) Competition for food
D) Volcanic eruptions
C) Competition for food - Density-dependent factors intensify as the population density
increases (e.g., disease, competition, predation).
6. A J-shaped curve on a population graph is characteristic of:
A) Logistic growth
B) Exponential growth
C) Population decline
D) Zero population growth
B) Exponential growth
7. An S-shaped curve on a population graph is characteristic of:
A) Logistic growth
B) Exponential growth
C) Population decline
D) Irruptive growth
A) Logistic growth - It shows exponential growth initially, then levels off as it approaches the
carrying capacity.
8. The total fertility rate (TFR) is an estimate of:
A) The number of children born in a single year.
B) The number of children a woman will have in her lifetime.
C) The rate at which a population is increasing.
D) The number of live births per 1000 people.
B) The number of children a woman will have in her lifetime.
9. The "demographic transition" model describes the transition from:
A) High birth rates and high death rates to low birth rates and low death rates.
B) Rural to urban living.
, C) Agricultural to industrial economies.
D) High immigration to low immigration.
A) High birth rates and high death rates to low birth rates and low death rates.
10. A country in Stage 2 of the demographic transition is characterized by:
A) Low birth and death rates
B) High birth and death rates
C) High birth rates and declining death rates
D) Declining birth rates and low death rates
C) High birth rates and declining death rates - This leads to a rapid increase in population.
Community Ecology & Species Interactions
11. The competitive exclusion principle states that:
A) Two species cannot coexist indefinitely in the same niche.
B) Competition always leads to the extinction of both species.
C) Species will always partition resources to avoid competition.
D) Predation is more important than competition.
A) Two species cannot coexist indefinitely in the same niche.
12. A relationship in which one organism is harmed and the other is unaffected is called:
A) Mutualism
B) Commensalism
C) Amensalism
D) Parasitism
C) Amensalism
13. Resource partitioning is a result of:
A) Increased competition between two species.
B) Character displacement to reduce niche overlap.
C) One species going extinct.
D) The introduction of a new predator.
B) Character displacement to reduce niche overlap.
14. A keystone species is one that:
A) Is the most abundant species in the community.
B) Has a disproportionately large effect on its environment relative to its abundance.
ACCURATE QUESTIONS AND VERIFIED CORRECT
SOLUTIONS WITH RATIONALES || 100%
GUARANTEED PASS <LATEST VERSION>
Population Ecology
1. What is a population's carrying capacity (K)?
A) The maximum population size that a particular environment can sustain indefinitely.
B) The maximum rate of population growth.
C) The initial size of a population when it first colonizes an area.
D) The number of individuals that die each year.
A) The maximum population size that a particular environment can sustain indefinitely.
2. Which type of species is most likely to be an r-strategist?
A) Elephant
B) Blue Whale
C) Dandelion
D) Oak Tree
C) Dandelion - R-strategists are species that have high reproductive rates, short lifespans,
and little parental care, typical of many weeds and insects.
3. A population with an age structure diagram that has a wide base (many young individuals)
is likely to:
A) Experience slow growth or decline
B) Experience rapid growth
C) Have reached its carrying capacity
D) Be dominated by post-reproductive individuals
B) Experience rapid growth - A wide base indicates a high proportion of young people who
will soon enter their reproductive years.
4. The formula for calculating population growth rate, (Births - Deaths) / Total Population,
gives you the:
A) Total growth
B) Exponential growth
,C) Per capita growth rate
D) Carrying capacity
C) Per capita growth rate
5. Density-dependent factors that limit population growth include:
A) Hurricanes
B) Wildfires
C) Competition for food
D) Volcanic eruptions
C) Competition for food - Density-dependent factors intensify as the population density
increases (e.g., disease, competition, predation).
6. A J-shaped curve on a population graph is characteristic of:
A) Logistic growth
B) Exponential growth
C) Population decline
D) Zero population growth
B) Exponential growth
7. An S-shaped curve on a population graph is characteristic of:
A) Logistic growth
B) Exponential growth
C) Population decline
D) Irruptive growth
A) Logistic growth - It shows exponential growth initially, then levels off as it approaches the
carrying capacity.
8. The total fertility rate (TFR) is an estimate of:
A) The number of children born in a single year.
B) The number of children a woman will have in her lifetime.
C) The rate at which a population is increasing.
D) The number of live births per 1000 people.
B) The number of children a woman will have in her lifetime.
9. The "demographic transition" model describes the transition from:
A) High birth rates and high death rates to low birth rates and low death rates.
B) Rural to urban living.
, C) Agricultural to industrial economies.
D) High immigration to low immigration.
A) High birth rates and high death rates to low birth rates and low death rates.
10. A country in Stage 2 of the demographic transition is characterized by:
A) Low birth and death rates
B) High birth and death rates
C) High birth rates and declining death rates
D) Declining birth rates and low death rates
C) High birth rates and declining death rates - This leads to a rapid increase in population.
Community Ecology & Species Interactions
11. The competitive exclusion principle states that:
A) Two species cannot coexist indefinitely in the same niche.
B) Competition always leads to the extinction of both species.
C) Species will always partition resources to avoid competition.
D) Predation is more important than competition.
A) Two species cannot coexist indefinitely in the same niche.
12. A relationship in which one organism is harmed and the other is unaffected is called:
A) Mutualism
B) Commensalism
C) Amensalism
D) Parasitism
C) Amensalism
13. Resource partitioning is a result of:
A) Increased competition between two species.
B) Character displacement to reduce niche overlap.
C) One species going extinct.
D) The introduction of a new predator.
B) Character displacement to reduce niche overlap.
14. A keystone species is one that:
A) Is the most abundant species in the community.
B) Has a disproportionately large effect on its environment relative to its abundance.
