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APES MIDTERM EXAM MULTIPLE
CHOICE 2026 QUESTIONS AND
ANSWERS| ACE YOUR GRADES.
What is the major source of phosphorus on land?
A) Deposition from atmospheric phosphorus
B) Compounds that are formed by autotrophs during
photosynthesis
C) Compounds released from the weathering of rocks
D) Compounds formed from bacterial conversion
E) Compounds dissolved in precipitation - correct answer -C
The addition of a limiting nutrient to an ecosystem may lead to an
algal bloom. What effect will this algal bloom have on the oxygen
content of the water?
A) Cause O2 levels to increase overall
B) Cause O2 levels to decrease, leading to hypoxic conditions
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C) Have no impact on the oxygen content of the water
D) Cause rapid fluctuations of oxygen in the water
E) O2 content will vary based on depth of water - correct answer -
B
Which of the following has the biggest impact on the resilience of
an ecosystem?
A) Amount of time the disturbance lasts
B) Amount of time the ecosystem has been established
C) Amount of predators present in the ecosystem
D) Amount of human intervention that is allowed
E) Amount of genetic biodiversity of the ecosystem - correct
answer -E
Which of the following best describes an ecosystem?
APES MIDTERM EXAM MULTIPLE
CHOICE 2026 QUESTIONS AND
ANSWERS| ACE YOUR GRADES.
What is the major source of phosphorus on land?
A) Deposition from atmospheric phosphorus
B) Compounds that are formed by autotrophs during
photosynthesis
C) Compounds released from the weathering of rocks
D) Compounds formed from bacterial conversion
E) Compounds dissolved in precipitation - correct answer -C
The addition of a limiting nutrient to an ecosystem may lead to an
algal bloom. What effect will this algal bloom have on the oxygen
content of the water?
A) Cause O2 levels to increase overall
B) Cause O2 levels to decrease, leading to hypoxic conditions
, Page | 2
C) Have no impact on the oxygen content of the water
D) Cause rapid fluctuations of oxygen in the water
E) O2 content will vary based on depth of water - correct answer -
B
Which of the following has the biggest impact on the resilience of
an ecosystem?
A) Amount of time the disturbance lasts
B) Amount of time the ecosystem has been established
C) Amount of predators present in the ecosystem
D) Amount of human intervention that is allowed
E) Amount of genetic biodiversity of the ecosystem - correct
answer -E
Which of the following best describes an ecosystem?
