BIO 320 ECOLOGY EXAM 3 2025/2026 ALL LATEST STUDY
QUESTIONS WITH CORRECT ANSWERS GUARANTEED PASS |
RATED A+
1. Nutrients deposited on leaves as dust and materials leached from leaves through insect
action are most often transported to the forest floor by
A) animal activity.
B) throughfall.
C) wind action.
D) sap flow. - Answer>>> B) throughfall.
2. In most terrestrial and many aquatic ecosystems, the ________ food chain is the
dominant pathway of energy flow.
A) detrital
B) grazing
C) consumer
D) heterotroph - Answer>>> A) detrital
3. Which of the following can be considered a habitat corridor?
A) a large lake in a city park
B) an abandoned agricultural field in an urban area
C) a strip of forest along the banks of a river flowing from a forested mountain through a city
D) a patch of forest within a city park - Answer>>> C) a strip of forest along the banks of a river
flowing from a forested mountain through a city
4. Secondary production is limited primarily by
A) water availability.
B) nutrient availability.
,C) primary production.
D) light availability. - Answer>>> C) primary production.
5. Succession in a community involves
A) only autotrophic species.
B) only heterotrophic species.
C) both autotrophic and heterotrophic species.
D) only detritivorous species. - Answer>>> C) both autotrophic and heterotrophic species.
6. Which of the following is an example of an allogenic change that drives succession?
A) seasonal changes in temperature, photoperiod, and light intensity
B) increased shading of seedlings by adult trees in a forest
C) increased nitrogen availability in soil due to the presence of leguminous plants
D) reduced salinity due to surface shading by grasses in a salt marsh - Answer>>> A) seasonal
changes in temperature, photoperiod, and light intensity
7. As glaciers in North America melted, formerly glaciated areas were invaded by
A) ice.
B) tundralike vegetation.
C) boreal forest, dominated by spruce and jack pine.
D) various species of trees, including spruce, white pine, oaks, and maples. - Answer>>> D)
various species of trees, including spruce, white pine, oaks, and maples.
8. The process of decomposition releases ________ to bacteria and fungi.
A) oxygen
B) energy
C) glucose
, D) protein - Answer>>> B) energy
9. As decomposition proceeds, which molecule is lost to the atmosphere?
A) H2O
B) CH4
C) CO2
D) NH3 - Answer>>> C) CO2
10.In general, litter with a C:N ratio greater than 30 leads to immobilization, litter with a
C:N ratio less than 20 leads to mineralization, and litter with a C:N ratio of 20—30 leads
to a balance of immobilization and mineralization resulting in no net N production. If
garlic mustard leaf litter collected on the forest floor had 43.2% C and 1.16% N, this
tissue would lead to
A) immobilization.
B) mineralization.
C) a balance of immobilization and mineralization.
D) sterilization - Answer>>> C) a balance of immobilization and mineralization.
11. The microbial loop results from
A) fungal attack on litter and subsequent consumption by microbivores.
B) leaching of litter that stimulates detritivores.
C) enhanced decomposition of labile litter materials enhancing food web turnover.
D) exudate release in the rhizosphere stimulating decomposition and nutrient release -
Answer>>> D) exudate release in the rhizosphere stimulating decomposition and nutrient release
12. The rate of nutrient cycling in an ecosystem
A) depends only on the rate of photosynthesis.
QUESTIONS WITH CORRECT ANSWERS GUARANTEED PASS |
RATED A+
1. Nutrients deposited on leaves as dust and materials leached from leaves through insect
action are most often transported to the forest floor by
A) animal activity.
B) throughfall.
C) wind action.
D) sap flow. - Answer>>> B) throughfall.
2. In most terrestrial and many aquatic ecosystems, the ________ food chain is the
dominant pathway of energy flow.
A) detrital
B) grazing
C) consumer
D) heterotroph - Answer>>> A) detrital
3. Which of the following can be considered a habitat corridor?
A) a large lake in a city park
B) an abandoned agricultural field in an urban area
C) a strip of forest along the banks of a river flowing from a forested mountain through a city
D) a patch of forest within a city park - Answer>>> C) a strip of forest along the banks of a river
flowing from a forested mountain through a city
4. Secondary production is limited primarily by
A) water availability.
B) nutrient availability.
,C) primary production.
D) light availability. - Answer>>> C) primary production.
5. Succession in a community involves
A) only autotrophic species.
B) only heterotrophic species.
C) both autotrophic and heterotrophic species.
D) only detritivorous species. - Answer>>> C) both autotrophic and heterotrophic species.
6. Which of the following is an example of an allogenic change that drives succession?
A) seasonal changes in temperature, photoperiod, and light intensity
B) increased shading of seedlings by adult trees in a forest
C) increased nitrogen availability in soil due to the presence of leguminous plants
D) reduced salinity due to surface shading by grasses in a salt marsh - Answer>>> A) seasonal
changes in temperature, photoperiod, and light intensity
7. As glaciers in North America melted, formerly glaciated areas were invaded by
A) ice.
B) tundralike vegetation.
C) boreal forest, dominated by spruce and jack pine.
D) various species of trees, including spruce, white pine, oaks, and maples. - Answer>>> D)
various species of trees, including spruce, white pine, oaks, and maples.
8. The process of decomposition releases ________ to bacteria and fungi.
A) oxygen
B) energy
C) glucose
, D) protein - Answer>>> B) energy
9. As decomposition proceeds, which molecule is lost to the atmosphere?
A) H2O
B) CH4
C) CO2
D) NH3 - Answer>>> C) CO2
10.In general, litter with a C:N ratio greater than 30 leads to immobilization, litter with a
C:N ratio less than 20 leads to mineralization, and litter with a C:N ratio of 20—30 leads
to a balance of immobilization and mineralization resulting in no net N production. If
garlic mustard leaf litter collected on the forest floor had 43.2% C and 1.16% N, this
tissue would lead to
A) immobilization.
B) mineralization.
C) a balance of immobilization and mineralization.
D) sterilization - Answer>>> C) a balance of immobilization and mineralization.
11. The microbial loop results from
A) fungal attack on litter and subsequent consumption by microbivores.
B) leaching of litter that stimulates detritivores.
C) enhanced decomposition of labile litter materials enhancing food web turnover.
D) exudate release in the rhizosphere stimulating decomposition and nutrient release -
Answer>>> D) exudate release in the rhizosphere stimulating decomposition and nutrient release
12. The rate of nutrient cycling in an ecosystem
A) depends only on the rate of photosynthesis.
