Bio 322 self quiz questions 3 UPDATED
ACTUAL Exam Questions and CORRECT
Answers
Which of the following statements regarding freshwater ecosystems is false?
A. Species that rely on freshwater habitats are overrepresented on lists of at-risk species
compared to terrestrial species.
B. The extinction rate of freshwater species is estimated to be three times higher than that of
marine species and five times higher than that of terrestrial species.
C. Freshwater ecosystems account for about 6% of Earth s surface, and about 1% of all described
species rely on freshwater ecosystems for part or all of their life cycle.
D. Freshwater ecosystems provide valuable ecosystem services ranging from provision,
regulation, and purification of fresh water to flood control and sediment transport. - CORRECT
ANSWER -C
This statement is false because the numbers are reversed. Freshwater ecosystems in fact account
for only 1% of Earth's surface but support about 6% of all described species through part or all of
their life cycle.
The IUCN lists approximately one-third of all evaluated amphibian species as vulnerable,
endangered, or critically endangered. Which of the following threats are thought to be
responsible for the widespread amphibian decline?
A. Overharvest
B. Habitat destruction
C. Fungal disease
D. All of the above - CORRECT ANSWER -D
Amphibian decline has been linked to habitat destruction, overharvest, and a fungal disease that
may be exacerbated by other environmental stresses. Other possible causes include climate
change, introduced predators, and increased exposure to UV radiation due to thinning of the
atmospheric ozone layer.
, Only 2.5% of all water on Earth is fresh water, as opposed to brackish or salt water. Most of this
fresh water can be found in
A. lakes and rivers.
B. shallow aquifers, accessible for human use.
C. deep aquifers, inaccessible for human use.
D. glaciers or polar ice caps. - CORRECT ANSWER -D
About 70% of Earth's fresh water is frozen in glaciers and the ice caps.
Which of the following statements describing how global climate change is predicted to affect
the supply of fresh water is false?
A. The volume of precipitation will decline uniformly across landmasses.
B. Rising sea level will increase the extent of saltwater intrusion in coastal rivers and aquifers.
C. Melting of mountain glaciers will cause increased flooding in the short term and water
shortages in the long term.
D. Precipitation will increasingly come in the form of rain rather than snow, which will
exacerbate flooding during the rainy season and water shortages during the dry season. -
CORRECT ANSWER -A
This statement is false. In fact, climate models disagree on the volume of precipitation will
change in various regions—the volume may go down in some areas but up in others. The models
agree, however, that the form of precipitation will increasingly shift toward rain rather than
snow.
Besides blocking the movement of fish and invertebrates, dams harm ecosystems by
A. converting fast-flowing water into large lake-like habitats.
B. reducing the seasonal variability of stream flow.
C. flooding and thereby destroying riparian habitats.
D. All of the above - CORRECT ANSWER -D
ACTUAL Exam Questions and CORRECT
Answers
Which of the following statements regarding freshwater ecosystems is false?
A. Species that rely on freshwater habitats are overrepresented on lists of at-risk species
compared to terrestrial species.
B. The extinction rate of freshwater species is estimated to be three times higher than that of
marine species and five times higher than that of terrestrial species.
C. Freshwater ecosystems account for about 6% of Earth s surface, and about 1% of all described
species rely on freshwater ecosystems for part or all of their life cycle.
D. Freshwater ecosystems provide valuable ecosystem services ranging from provision,
regulation, and purification of fresh water to flood control and sediment transport. - CORRECT
ANSWER -C
This statement is false because the numbers are reversed. Freshwater ecosystems in fact account
for only 1% of Earth's surface but support about 6% of all described species through part or all of
their life cycle.
The IUCN lists approximately one-third of all evaluated amphibian species as vulnerable,
endangered, or critically endangered. Which of the following threats are thought to be
responsible for the widespread amphibian decline?
A. Overharvest
B. Habitat destruction
C. Fungal disease
D. All of the above - CORRECT ANSWER -D
Amphibian decline has been linked to habitat destruction, overharvest, and a fungal disease that
may be exacerbated by other environmental stresses. Other possible causes include climate
change, introduced predators, and increased exposure to UV radiation due to thinning of the
atmospheric ozone layer.
, Only 2.5% of all water on Earth is fresh water, as opposed to brackish or salt water. Most of this
fresh water can be found in
A. lakes and rivers.
B. shallow aquifers, accessible for human use.
C. deep aquifers, inaccessible for human use.
D. glaciers or polar ice caps. - CORRECT ANSWER -D
About 70% of Earth's fresh water is frozen in glaciers and the ice caps.
Which of the following statements describing how global climate change is predicted to affect
the supply of fresh water is false?
A. The volume of precipitation will decline uniformly across landmasses.
B. Rising sea level will increase the extent of saltwater intrusion in coastal rivers and aquifers.
C. Melting of mountain glaciers will cause increased flooding in the short term and water
shortages in the long term.
D. Precipitation will increasingly come in the form of rain rather than snow, which will
exacerbate flooding during the rainy season and water shortages during the dry season. -
CORRECT ANSWER -A
This statement is false. In fact, climate models disagree on the volume of precipitation will
change in various regions—the volume may go down in some areas but up in others. The models
agree, however, that the form of precipitation will increasingly shift toward rain rather than
snow.
Besides blocking the movement of fish and invertebrates, dams harm ecosystems by
A. converting fast-flowing water into large lake-like habitats.
B. reducing the seasonal variability of stream flow.
C. flooding and thereby destroying riparian habitats.
D. All of the above - CORRECT ANSWER -D
