1|Page
ENVS 1126 AIXIN HOU- EXAM 1 NEWEST 2026
ACTUAL EXAM QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) ALL
ANSWERED {50 Q & A} ALREADY GRADED A+ |
BRAND NEW! | 100% VERIFIED
Which field was the control group?
a. the east field was the control group
b. both fields were controls for one another
c. there were no controls in this experiment
d. the west field was the control group - ✔✔✔ Correct Answer >
the west field was the control group.
What once was an open pasture on a long-abandoned farm has
changed over time without the direct influence of humans. After
the cattle had been removed, shrubs and bushes could be seen
dotting the grass-covered hillsides. A few years later, small pine
trees and then larger deciduous trees appeared. Now, there are
so many trees and shaded regions it is difficult to tell that this
was once a field. These ecological changes in the abandoned
pasture represent
a. primary succession.
,2|Page
b. aquatic to terrestrial succession.
c. secondary succession.
d. intermediate succession. - ✔✔✔ Correct Answer > secondary
succession
A population is growing exponentially with a doubling time of 10
years. If the size of the population now is 50, what will be the
size of the population 30 years from now?
a. 400
b. 200
c. 300
d. 500 - ✔✔✔ Correct Answer > 400
Why is exponential growth unsustainable?
a. A species cannot exceed carrying capacity indefinitely.
b. It produces too many old individuals.
c. It is found only in r-selected species. - ✔✔✔ Correct Answer >
A species cannot exceed carrying capacity indefinitely.
Which of the following is not a part of environmental resistance
to population growth?
a. Lack of nutrients
, 3|Page
b. Reproductive rate
c. Parasites
d. Predators - ✔✔✔ Correct Answer > Reproductive rate
Which one of the following is a density-independent factor that is
not involved in maintaining population equilibrium?
a. Food supply
b. Competition
c. Predation
d. Drought - ✔✔✔ Correct Answer > Drought
Some beetles escape from a ship and fly to a small island
covered with grass but with no trees or beetle predators. As the
beetles feed, they destroy all the grasses. But with abundant
food, the beetle population soars, doubling in size every month.
After about a year, the population crashes as thousands of
beetles have destroyed almost all of the plants and there is little
left to feed the large population. This scenario best illustrates
a. logistic growth ending at its carrying capacity.
b. a population that has stabilized near its carrying capacity.
c. constant growth followed by equilibrium.
ENVS 1126 AIXIN HOU- EXAM 1 NEWEST 2026
ACTUAL EXAM QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) ALL
ANSWERED {50 Q & A} ALREADY GRADED A+ |
BRAND NEW! | 100% VERIFIED
Which field was the control group?
a. the east field was the control group
b. both fields were controls for one another
c. there were no controls in this experiment
d. the west field was the control group - ✔✔✔ Correct Answer >
the west field was the control group.
What once was an open pasture on a long-abandoned farm has
changed over time without the direct influence of humans. After
the cattle had been removed, shrubs and bushes could be seen
dotting the grass-covered hillsides. A few years later, small pine
trees and then larger deciduous trees appeared. Now, there are
so many trees and shaded regions it is difficult to tell that this
was once a field. These ecological changes in the abandoned
pasture represent
a. primary succession.
,2|Page
b. aquatic to terrestrial succession.
c. secondary succession.
d. intermediate succession. - ✔✔✔ Correct Answer > secondary
succession
A population is growing exponentially with a doubling time of 10
years. If the size of the population now is 50, what will be the
size of the population 30 years from now?
a. 400
b. 200
c. 300
d. 500 - ✔✔✔ Correct Answer > 400
Why is exponential growth unsustainable?
a. A species cannot exceed carrying capacity indefinitely.
b. It produces too many old individuals.
c. It is found only in r-selected species. - ✔✔✔ Correct Answer >
A species cannot exceed carrying capacity indefinitely.
Which of the following is not a part of environmental resistance
to population growth?
a. Lack of nutrients
, 3|Page
b. Reproductive rate
c. Parasites
d. Predators - ✔✔✔ Correct Answer > Reproductive rate
Which one of the following is a density-independent factor that is
not involved in maintaining population equilibrium?
a. Food supply
b. Competition
c. Predation
d. Drought - ✔✔✔ Correct Answer > Drought
Some beetles escape from a ship and fly to a small island
covered with grass but with no trees or beetle predators. As the
beetles feed, they destroy all the grasses. But with abundant
food, the beetle population soars, doubling in size every month.
After about a year, the population crashes as thousands of
beetles have destroyed almost all of the plants and there is little
left to feed the large population. This scenario best illustrates
a. logistic growth ending at its carrying capacity.
b. a population that has stabilized near its carrying capacity.
c. constant growth followed by equilibrium.
