1. Which of the following types of
molecules contain carbon?
I. carbohydrates (sugars, starches)
II. proteins
III. lipids (fats and oils)
IV. DNA
A. I only
B. II only
C. I and II
D. I and III
E. All of the above
2. In photosynthesis, which of the
following is/are produced?
A.Carbon dioxide (CO2)
B. Oxygen (O2)
C. Glucose (C6H12O2)
D. A and C
E. B and C
3. As part of the carbon cycle, which
process return carbon to the atmosphere
in the form of carbon dioxide?
A. Photosynthesis
B. Cellular respiration
C. Combustion
(burning)
D. A and C
E. B and C
4. The amount of carbon dioxide in
the atmosphere has been
increasing. The second largest
cause of this increase is ___.
A. combustion of
fossil fuels
B. respiration
C. deforestation
D. photosynthesis
5. All living things require nitrogen to build
certain organic molecules such as DNA.
While the atmosphere is 78% nitrogen gas
(N2) most organisms can not break the triple
bond in this molecule. The process of
converting N2 into usable nitrogen
compounds (ammonia) is called.
A. Combustion
B. Denitification
C. Nitrogen-fixing
D. Degradation
6. What type of organism can
perform nitrogen-fixing.
A. Plants
B. Certain bacteria that can live in the soil or
in root nodules of certain plants
C. Certain bacteria that live in hydrothermal
vents.
D. A and B
E. B and C
7. Thermal pollution means an increase in
______________ in a body of water. It causes
_______ in the oxygen concentration in the
aquatic ecosystem.
A. Heat; increase
B. Heat; decrease
C. Nutrients; increase
D. Nutrients; decrease
The solubility of gases decreases as the temperature
increases. More likely to come out of solution at higher
temperatures.
Soda goes flat
(loses dissolved
gas) as it gets
warm
8. Eutrophication means _________
nutrient levels (nitrogen, phosphorus,
organic matter) in an aquatic ecosystem.
It results in _______________ oxygen
levels in the water.
A. high ; low
B. high; high
C. low; low
D. low; high
9. The reason that eutrophication
results in low oxygen levels is that
A. The nutrients cause an overgrowth of algae
to occur
B. Excessive photosynthesis by the algae
occurs
C. Decomposers deplete (use up) the oxygen
D. A and B
E. A and C
F. A, B and C
Review: Remember the irony of eutrophication.
High nutrient levels – from fertilizer runoff, farm waste, septic
runoff- causes an overgrowth of algae because the increase in
the typically limiting nutrients of nitrogen and phosphorus allow
for greater algae growth.
Algae is photosynthetic so you might expect oxygen levels to
increase. However, fast growing algae can block sunlight.
As the algae and other aquatic plants die, the decomposers use
oxygen causing the oxygen levels to drop.
Lake with eutrophication may have fish kills when the oxygen
level becomes too depleted for some fish species.
10. A temperate forest with deciduous
trees has ________ temperatures and
trees that ___________ .
A.extreme temperatures; have cones.
B. extreme temperatures; lose their leaves
C. moderate temperatures; have cones
D. moderate temperatures; lose their leaves
11. The process by which plants lose
water from their leaves is called
A.Perspiration
B.Infiltration
C.Percolation
D.Transpiration
12. A change in a region over time,
with a changing composition of plants,
is called
A.Progression
B. Evolution
C. Succession
D. Adaptation
E. B and D
13. After a forest fire which destroys most
vegetation, but leaves some organic matter in
the ecosystem, which type of succession
occurs?
A.Primary
B.Secondary
C.Tertiary
14. Which of the following biomes generally
has the highest biodiversity (greatest number of
different species)?
A.Temperate
deciduous forest
B.Taiga (Boreal forest)
C.Tropical rainforest
D.Grasslands
E.Tundra
15. The chemical equation for photosynthesis is
A. C6H12O6 + 6 CO2  6 O2 + 6 H2O
B. C6H12O6 + 6 O2  6 CO2 + 6 H2O
C. 6 CO2 + 6 H2O 6 O2 + C6H12O6
D. 6 O2 + 6 H2O 6 CO2 + C6H12O6
16. A species of tropical bird follows army ants in
the forest. These birds eat insects that have
escaped from the colony of army ants as it
moves through the forest (not the army ants
themselves). Which type of symbiotic relationship
is this between these birds and the army ants?
A. Mutualism
B. Commensalism
C. Parasitism
17. Which type of symbiotic relationship is
found between a flower and its pollinator?
A.Mutualism
B.Commensalism
C.Parasitism
18. The role an organism plays in
an ecosystem is part of its
A. habitat
B. niche
C. both A and B
D. neither A nor B
19. Soil erosion (the loss of soil
especially by wind and water) is
increased by
A. Tilling fields
B. Removing vegetation
(plants)
C. Both A and B
D. Neither A nor B
20. An species that is brought to a new
ecosystem may become invasive because
A. It may not have any predators
in the new ecosystem
B. May start to reproduce at a
higher rate
C. It may breed with native
species
1. E
2. E
3. E
4. C
5. C
6. B
7. B
8. A
9. E
10.D
11.D
12.C
13.B
14.C
15.C
16.B
17.A
18.B
19.C
20.A