APES UNIT 2 Practice TEST
Multiple Choice
Identify the choice that best completes the statement or answers the question.
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1. The most fundamental unit of ecology is
a. a species
b. a population
c. a community
d. an ecosystem
e. an organism
2. Estimates of the number of species existing on the earth range from
a. 4 to 100.
b. 4 to 100 thousand.
c. 4 to 100 million.
d. 4 to 100 billion.
e. 4 to 100 trillion.
3. The largest numbers of species of organisms on the earth are currently
a. microorganisms and fungi.
b. amphibians and reptiles.
c. insects and fungi.
d. insects and microorganisms.
e. mammals.
4. An example of a microbe is
a. bacteria.
b. protozoa.
c. fungi.
d. yeast.
e. All of the above.
5. The following choices list levels of organization of matter that claim the attention of ecologists. Which
correctly lists these levels in sequence from narrower to broader focus?
a. organisms-populations-communities-ecosystems-ecosphere
b. organisms-communities-populations-ecosystems-ecosphere
c. organisms-populations-communities-ecosphere-ecosystems
d. ecosphere-ecosystems-communities-populations-organisms
e. ecosphere-populations-communities-ecosystems-organisms
6. A group of individuals of the same species occupying a given area at the same time is called a
a. species.
b. population.
c. community.
d. genus.
e. niche.
7. A community of living organisms interacting with one another and the physical and chemical factors of their
nonliving environment is called
a. a species.
b. an ecosystem.
c. a population.
d. a lithosphere.
e. a community.
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8. All of the following are characteristic of life forms except
a. highly diffuse internal structure and organization.
b. the ability to capture and transform matter and energy from the environment.
c. the ability to reproduce.
d. the ability to adapt to external change by mutations.
e. the ability to react to stimuli.
9. All physical forms of water (solid, liquid, and gas) make up the
a. atmosphere.
b. lithosphere.
c. biosphere.
d. hydrosphere.
e. troposphere.
10. Fossil fuels and minerals are found in the
a. atmosphere.
b. lithosphere.
c. biosphere.
d. hydrosphere.
e. troposphere.
11. Where would a geologists collect rock and soil samples?
a. atmosphere
b. lithosphere
c. biosphere
d. hydrosphere
e. troposphere
12. Life on earth depends on interaction of gravity, the cycling of matter and
a. one-way flow of energy.
b. cycling of energy.
c. one-way flow of matter.
d. the destruction of matter.
e. the consumption of matter.
13. Which of the following statements is false?
a. About one-third of the solar energy hitting the earth is immediately reflected back to
space.
b. A spectrum of electromagnetic radiation emanates from the sun.
c. About one-third of the solar energy hitting the earth warms the land and lower atmosphere,
runs cycles of matter, and generates winds.
d. Less than 1% of sunlight is captured via photosynthesis.
e. None of these answers.
14. Aquatic life zones are the aquatic equivalent of
a. communities.
b. ecosystems.
c. biomes.
d. ecospheres.
e. populations.
15. All of the following are major causes of differences among aquatic ecosystems except
a. temperature.
b. precipitation.
c. salinity.
d. depth of sunlight penetration.
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____ 17.
____ 18.
____ 19.
____ 20.
____ 21.
____ 22.
____ 23.
e. dissolved oxygen.
The zone in which no member of a population can live is called the
a. zone of intolerance
b. zone of physiological stress
c. lower limit of tolerance
d. upper limit of tolerance
e. optimum range
Autotrophs
a. might eat heterotrophs.
b. are known as decomposers.
c. cannot do photosynthesis.
d. can live without heterotrophs.
e. are omnivores.
Photosynthesis
a. converts glucose into energy and water.
b. requires the combustion of carbon.
c. produces carbon dioxide and oxygen gas.
d. yields glucose and oxygen gas as products.
e. yields glucose and carbon dioxide gas as products.
You are a scientist intrigued by organisms that can create complex molecules through chemosynthesis. The
habitat you are most likely to visit is
a. an island paradise.
b. an inland sand dune.
c. a hydrothermal vent.
d. a prairie.
e. a forest.
Organisms that feed on dead organisms are called
a. producers.
b. carnivores.
c. autotrophs.
d. scavengers.
e. omnivores.
Organisms that complete the final breakdown and recycling of organic materials from the remains or wastes
of all organisms are called
a. detritivores.
b. carnivores.
c. decomposers.
d. scavengers.
e. omnivores.
If something is biodegradable, it
a. can be broken down by autotrophs.
b. can be broken down by heterotrophs.
c. can be broken down by decomposers.
d. cannot be broken down by any living processes.
e. cannot be broken down by omnivores.
Anaerobic respiration may produce all of the following except
a. methane gas.
b. hydrogen sulfide.
c. carbon dioxide and water.
____ 24.
____ 25.
____ 26.
____ 27.
____ 28.
____ 29.
____ 30.
____ 31.
d. ethyl alcohol.
e. lactic acid.
The process which results in alcoholic beverages is
a. aerobic respiration.
b. anaerobic respiration.
c. photosynthesis.
d. chemosynthesis.
e. inspiration.
Which of the following terms includes the others?
a. ecological diversity
b. biological diversity
c. genetic diversity
d. ecological diversity
e. functional diversity
Most of the energy input in a food chain is
a. in the form of heat.
b. converted to biomass.
c. recycled as it reaches the chain's end.
d. degraded to low-quality heat.
e. converted to carbon dioxide.
The ecological efficiency at each trophic level of a particular ecosystem is 20%. If the green plants of the
ecosystem capture 100 units of energy, about ____ units of energy will be available to support herbivores, and
about ____ units of energy will be available to support carnivores.
a. 120 . . . 140
b. 120. . . 240
c. 20. . . 2
d. 20. . . 4
e. 20 . . .1
The pyramid which best explains why there are typically only four to five links in a food chain is the pyramid
of
a. energy.
b. biomass.
c. numbers.
d. matter.
e. productivity.
Net primary productivity
a. is the rate at which producers manufacture chemical energy through photosynthesis.
b. is the rate at which producers use chemical energy through respiration.
c. is the rate of photosynthesis plus the rate of respiration.
d. is usually reported as the energy output of an area of producers over a given time.
e. is the energy input of an area of producers over a given time.
Which of the following ecosystems has the lowest level of kilocalories per square meter per year?
a. open ocean
b. tropical rain forest
c. agricultural land
d. lakes and streams
e. temperate forest
A cross-sectional view of the ____ in a soil is properly termed a soil ____.
a. horizons . . . profile
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____ 39.
b. horizons . . . sample
c. profile . . . sample
d. surface litter . . . profile
e. profile . . . horizon.
The ____-horizon of a soil contains no organic material and is composed of parent material.
a. A
b. B
c. C
d. O
e. D
The A-horizon of soil is commonly referred to as
a. topsoil.
b. surface litter.
c. subsoil.
d. parent rock.
e. humus.
As it is weathered, ____ gives rise to the C-horizon.
a. parent material
b. leaching
c. subsoil
d. bed rock
e. B-horizon
The soil layer containing unique colors and often iron, aluminum, humus, and clay leached from higher layers
is the
a. parent material.
b. zone of leaching.
c. subsoil.
d. topsoil.
e. bed rock.
Freshly fallen leaves, organic debris, and partially decomposed organic matter are indicative of the
a. surface litter.
b. zone of leaching.
c. parent material.
d. subsoil.
e. humus.
The dissolving of material from the upper layers of the soil and its movement to lower horizons is called
a. percolation.
b. weathering.
c. accumulation.
d. leaching.
e. humus.
Leaching occurs when
a. humus is dissolved.
b. water removes soluble soil components.
c. organic compounds slowly decay.
d. rock is shattered by frost action.
e. water stays in the soil.
Red and yellow colors in a soil horizon usually indicate a
a. high percentage of sand.
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b. high percentage of lime and gypsum.
c. lack of iron oxide.
d. low organic matter content.
e. large number of soil organisms.
Leaf mold, a humus-mineral mixture, and silty loam are indicative of
a. coniferous forest soil.
b. deciduous forest soil.
c. tropical forest soil.
d. grassland soil.
e. desert soil.
A soil sample of closely packed pebbles that is a mixture of minerals and low in humus probably came from a
a. coniferous forest.
b. desert.
c. deciduous forest.
d. tropical forest
e. grassland.
If you were a farmer, which type of soil would you choose for your crops?
a. silt
b. loam
c. clay
d. sand
e. gravel
Which of the following types of soils has the least pore space?
a. silt
b. loam
c. clay
d. sand
e. they all have equal pore space.
Which of the following types of soils holds the most water?
a. silt
b. loam
c. clay
d. sand
e. gravel
Sand has ____ permeability and ____ porosity.
a. high . . . high
b. high . . . low
c. low . . . high
d. low . . . low
e. medium . . . medium
The nitrogen cycle is an example of a(an)
a. hydrologic cycle.
b. sedimentary cycle.
c. carbohydrate cycle.
d. atmospheric cycle.
e. rock cycle.
The hydrologic cycle is driven primarily by
a. solar energy and gravity.
b. solar energy and the moon.
____ 48.
____ 49.
____ 50.
____ 51.
____ 52.
____ 53.
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____ 55.
c. solar energy and mechanical energy.
d. mechanical and chemical energy.
e. chemical energy from the moon.
The amount of water vapor found in a certain mass of air is the
a. relative humidity.
b. absolute humidity.
c. average humidity.
d. air pressure.
e. altitude.
Condensation nuclei form from all of the following except
a. sea salt.
b. soil dust.
c. carbon monoxide emitted from vehicles.
d. volcanic ash.
e. smoke.
Water covers about ____% of earth's surface.
a. 54
b. 64
c. 74
d. 84
e. 94
Water molecules ____ each other.
a. attract
b. repel
c. have no effect on
d. dissolve
e. diffuse
Which of the following statements is false?
a. Water has a very high heat capacity and changes temperature very slowly.
b. Water tends to ameliorate temperatures so that coastal towns do not show the temperature
ranges of towns in the interior of continents.
c. Water has a low heat of vaporization; that is, it evaporates very easily.
d. Water functions well as a coolant.
e. None of the above statements are false.
Which element could be called the "currency for energy exchange in living systems?"
a. nitrogen
b. oxygen
c. carbon
d. sulfur
e. phosphorus
Transfer of carbon between organisms depends primarily on
a. fuel combustion and decomposition.
b. photosynthesis and cellular respiration.
c. soil bacteria and precipitation.
d. volcanic activity and organic decay.
e. the rock cycle.
The two ways in which humans have most interfered with the carbon cycle are
a. removal of forests and aerobic respiration.
b. aerobic respiration and burning fossil fuels.
____ 56.
____ 57.
____ 58.
____ 59.
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____ 61.
____ 62.
____ 63.
c. respiration and photosynthesis.
d. burning fossil fuels and removal of forests and brush.
e. respiration and removal of forests.
Nitrogen is a major component of all of the following except
a. proteins.
b. nucleic acids.
c. ammonia.
d. groundwater.
e. DNA.
The form of nitrogen most usable to plants is
a. ammonia.
b. nitrogen gas.
c. proteins.
d. nitrates.
e. nitrites.
When organisms die, their nitrogenous organic compounds are converted to simpler inorganic compounds
such as ammonia through the process of
a. nitrification.
b. nitrogen fixation.
c. denitrification.
d. ammonification.
e. leaching.
Inorganic nitrogen-containing ions are converted into organic molecules through
a. nitrification.
b. nitrogen fixation.
c. denitrification.
d. assimilation.
e. leaching.
When nitrogen is added to aquatic systems, it is least likely to result in
a. depletion of oxygen in the water.
b. stimulated algae growth.
c. immediate decrease in gross primary productivity.
d. fish kills.
e. anoxic conditions.
Which of the following is not one of the common phosphorous reservoirs in the ecosystem?
a. soil
b. organisms
c. atmosphere
d. rocks
e. marine sediment
Phosphorous is used in the composition of all of the following except
a. fats in cell membranes.
b. DNA molecules.
c. bones and teeth.
d. proteins.
e. carbohydrates
All of the following are sources of phosphorous except
a. inorganic fertilizer.
b. runoff of animal wastes from feedlots.
____ 64.
____ 65.
____ 66.
____ 67.
____ 68.
____ 69.
____ 70.
____ 71.
c. detergents.
d. acid rain.
e. guano.
The major plant nutrient most likely to be a limiting factor is
a. phosphorous.
b. calcium.
c. manganese.
d. potassium.
e. nitrogen.
Organic sulfur-containing compounds include
a. sulfates.
b. carbohydrates and proteins.
c. fats and vitamins.
d. proteins and vitamins.
e. sulfites.
Humans add sulfur to the atmosphere by
a. refining petroleum.
b. smelting sulfur compounds or metallic minerals.
c. burning sulfur-containing fossil fuels.
d. All of these answers.
e. None of these answers.
Which statement describes field research least?
a. It has been used to develop most of our knowledge about ecosystems.
b. It is comparatively easy to set up controlled experiments.
c. It is relatively time-consuming.
d. It is relatively expensive.
e. None of these answers.
Which statement least characterizes laboratory research?
a. It allows measurement of model ecosystems and populations under controlled conditions.
b. It is faster than similar field research.
c. It is cheaper than similar field research.
d. It has been used to develop most of our knowledge about ecosystems.
e. None of these answers.
Which statement least characterizes systems analysis as a research strategy?
a. It is usually carried out by an expert in the field.
b. It has developed over the last twenty-five years.
c. It can be applied to complex systems that cannot be adequately studied in the field or
laboratory.
d. It can simulate ecosystems.
e. None of these answers.
One member of a system analysis team is a person who loves to tinker with variables to see the potential
impact of trying different solutions, to engage fully in the study of cause and effect. If you were a system
manager, to which stage of the system analysis would you assign this person?
a. system measurement
b. system simulation
c. system optimization
d. system modeling
e. data optimization
The American alligator is now listed as threatened because
____ 72.
____ 73.
____ 74.
____ 75.
____ 76.
____ 77.
____ 78.
a. their nesting mounds are easy targets.
b. their skins are used to make shoes, belts, and pocketbooks.
c. their meat is considered exotic.
d. All of these answers.
e. None of these answers.
Where is most of the world's biodiversity?
a. high-latitude forests
b. middle-latitude grasslands
c. low-latitude forests
d. polar grasslands
e. tundra
Which term means the opposite of the others?
a. exotic species
b. native species
c. alien species
d. nonnative species
e. generalist species
Which of the following statements about amphibians is false?
a. The oldest of today's amphibians were living as long as 150 million years ago.
b. Amphibians are important indicator species.
c. Amphibians are experiencing sharp population declines in a variety of habitats.
d. Amphibians eat many insects, second in number only to birds.
e. They are often considered keystone species.
Birds and trout make good
a. nonnative species.
b. native species.
c. keystone species.
d. indicator species.
e. generalist species.
Sea otters, dung beetles, and gopher tortoises are generally considered to be
a. nonnative species.
b. native species.
c. keystone species.
d. specialist species.
e. generalist species.
Species that can create and enhance habitats that can benefit other species in a community such as birds that
regenerate deforested areas and spread seeds through their droppings are called
a. keystone species
b. foundation species
c. native species
d. indicator species
e. invasive species
Which of the following statements is false?
a. When environmental conditions are changing rapidly, a generalist is usually better off than
a specialist.
b. The fundamental niche of a species is the full range of physical, chemical, and biological
factors it could use if there were no competition.
c. The competitive exclusion principle states that no two species with the same fundamental
niche can indefinitely occupy the same habitat.
____ 79.
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____ 81.
____ 82.
____ 83.
____ 84.
____ 85.
____ 86.
d. Interspecific competition is competition between two members of the same species.
e. Intraspecific competition is competition between two members of the same species.
The relationship between fire ants and native ant populations is best described as
a. mutualism.
b. commensalism.
c. intraspecific competition.
d. interspecific competition.
e. parasitism.
A new kitten is added to a home with an established older cat. The older cat is observed to gobble up its food
as well as that of the younger cat. This behavior is best described as
a. interference competition.
b. exploitation competition.
c. mutualism.
d. predation.
e. parasitism.
A new kitten is added to a home with an established older cat. You observe the older cat hiss and swat at the
younger kitten in the kitchen where they are fed. This behavior is best described as
a. interference competition.
b. exploitation competition.
c. mutualism.
d. predation.
e. parasitism.
Interspecific competition can be avoided by
a. eating at different times.
b. resource partitioning.
c. character displacement.
d. All of these answers.
e. None of these answers.
A shark is least likely to be killed
a. by a predator.
b. for sport.
c. out of fear.
d. for food.
e. for their jaws.
A relationship in which one species benefits while the other is neither helped nor harmed to any significant
degree is best labeled
a. competition.
b. predation.
c. commensalism.
d. parasitism.
e. mutualism.
Of the following relationships, the one most likely to be described as a positive feedback loop is
a. competition.
b. predation.
c. mutualism.
d. parasitism.
e. commensalism.
All of the following are ectoparasites except
a. fleas and ticks.
____ 87.
____ 88.
____ 89.
____ 90.
____ 91.
____ 92.
____ 93.
b. mosquitoes.
c. mistletoe.
d. tapeworms.
e. athlete's foot fungus.
All of the following illustrate the relationship of mutualism except
a. lichens.
b. epiphytes.
c. ants and acacias.
d. Rhizobium bacteria in root nodules of legumes.
e. flowering plants and insects.
The relationship between redwood trees and redwood sorrel is
a. competition.
b. predation.
c. parasitism.
d. commensalism.
e. mutualism.
Forms of nondestructive behavior between organisms include all of the following except
a. sharing resources by hunting at different times.
b. sharing resources by looking for food in different places.
c. parasitism.
d. mutualism.
e. commensalism.
Which of the following statements about primary succession is false?
a. It is initiated by pioneer species.
b. It often involves species changing the environment so that they can no longer thrive and
must be replaced by other species.
c. It generally results in more complex, more self-sustaining stages than the preceding ones.
d. It is an orderly progression from pioneer species to climax species indicative of the region
being studied.
e. All of these statements are true.
How long does it take natural processes to produce fertile soil?
a. weeks to months
b. months to years.
c. decades to a few centuries.
d. several centuries to several thousands of years.
e. several thousand years to millions of years.
Which of the following would undergo secondary succession?
a. cooled volcanic lava
b. an abandoned parking lot
c. a heavily polluted stream that has been cleaned up
d. a bare rock outcrop
e. a newly created shallow pond
Soil formation in primary succession is encouraged by
a. physical weathering.
b. lichens and mosses trapping soil particles.
c. secretion of acids by lichens.
d. All of these answers.
e. None of these answers.
____ 94. A field ecologist observes primary succession occurring over a period of years. Bare rock is colonized by
lichens that give way to moss that give way to ferns. She is most likely to report that the process guiding
succession in this ecosystem is
a. interspecific competition.
b. tolerance.
c. facilitation.
d. inhibition.
e. intraspecific competition.
____ 95. You observe a stand of dense hemlocks. You know squirrels from an adjacent area have brought pine cones to
the ecosystem, but no pine seedlings have sprouted. Of the following choices, the best label for this
observation is
a. primary succession.
b. tolerance.
c. tertiary succession.
d. inhibition.
e. facilitation.
____ 96. You observe a maple seedling grow successfully in a birch stand. All species thrive. The best label for this
observation would be
a. primary succession.
b. tolerance.
c. tertiary succession.
d. inhibition.
e. facilitation.
____ 97. In mature ecosystems
a. most plants are annuals.
b. species diversity is low.
c. the efficiency of energy use is high.
d. the efficiency of nutrient recycling is low.
e. there are few, mostly generalized, ecological niches.
____ 98. Ecologists would consider all of the following to be natural disturbances except
a. droughts.
b. floods.
c. deforestation.
d. fires.
e. frost.
____ 99. Most terrestrial ecosystems are a dynamic patchworks of vegetation providing
a. great biodiversity and sites for early successional species to gain a foothold.
b. great biodiversity and sites that favor late successional species.
c. moderate biodiversity and sites for all successional species.
d. moderate biodiversity and sites for early successional species to gain a foothold.
e. None of these answers.
____ 100. Which of the following refers to the ability of an organism to return to its former condition after a period of
stress?
a. stability
b. inertia
c. constancy
d. resilience
e. persistence
Essay
101. Measurements of dissolved oxygen (DO) are used to determine primary productivity in bodies of water.
a. Explain the relationship of dissovled oxygen to primary productivity.
b. How would the predicted levels of DO differ in each of the following pairs of water samples? Proved
suppor tfor your prediction. Be sure to include a discussion of net productivity and gross productivity in your
answer.
i. Pond water at 25 degrees Celsius vs. pond water at 15 degrees Celsius
ii. Pond water placed in the dark for 24 hours vs. pond water placed in light for 24
hours.
APES UNIT 2 Practice TEST
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The Nature of Ecology
The Nature of Ecology
The Nature of Ecology
The Nature of Ecology
The Nature of Ecology
The Nature of Ecology
The Nature of Ecology
The Nature of Ecology
The Earth's Life Support Systems
The Earth's Life Support Systems
The Earth's Life Support Systems
The Earth's Life Support Systems
The Earth's Life Support Systems
Ecosystem Components
Ecosystem Components
Ecosystem Components
Ecosystem Components
Ecosystem Components
Ecosystem Components
Ecosystem Components
Ecosystem Components
Ecosystem Components
Ecosystem Components
Ecosystem Components
Biodiversity
Energy Flow in Ecosystems
Energy Flow in Ecosystems
Energy Flow in Ecosystems
Energy Flow in Ecosystems
Energy Flow in Ecosystems
Soil: A Renewable Resource
Soil: A Renewable Resource
Soil: A Renewable Resource
Soil: A Renewable Resource
Soil: A Renewable Resource
Soil: A Renewable Resource
Soil: A Renewable Resource
Soil: A Renewable Resource
Soil: A Renewable Resource
Soil: A Renewable Resource
Soil: A Renewable Resource
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TOP:
B
PTS: 1
DIF: E
D
PTS: 1
DIF: E
C
PTS: 1
DIF: E
B
PTS: 1
DIF: E
D
PTS: 1
DIF: M
A
PTS: 1
DIF: M
B
PTS: 1
DIF: M
C
PTS: 1
DIF: M
C
PTS: 1
DIF: E
A
PTS: 1
DIF: E
C
PTS: 1
DIF: D
C
PTS: 1
DIF: M
B
PTS: 1
DIF: M
D
PTS: 1
DIF: D
D
PTS: 1
DIF: M
D
PTS: 1
DIF: M
D
PTS: 1
DIF: M
D
PTS: 1
DIF: M
C
PTS: 1
DIF: D
C
PTS: 1
DIF: M
D
PTS: 1
DIF: M
D
PTS: 1
DIF: D
A
PTS: 1
DIF: M
D
PTS: 1
DIF: M
D
PTS: 1
DIF: D
B
PTS: 1
DIF: M
How Do Ecologists Learn About Ecosystems?
D
PTS: 1
DIF: D
How Do Ecologists Learn About Ecosystems?
A
PTS: 1
DIF: D
How Do Ecologists Learn About Ecosystems?
B
PTS: 1
DIF: D
How Do Ecologists Learn About Ecosystems?
D
PTS: 1
DIF: E
C
PTS: 1
DIF: M
Community Structure and Species Diversity
D
PTS: 1
DIF: E
D
PTS: 1
DIF: M
D
PTS: 1
DIF: E
C
PTS: 1
DIF: E
B
PTS: 1
DIF: E
D
PTS: 1
DIF: D
Species Interactions: Competition and Predation
D
PTS: 1
DIF: E
Species Interactions: Competition and Predation
B
PTS: 1
DIF: M
Species Interactions: Competition and Predation
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Soil: A Renewable Resource
Soil: A Renewable Resource
Soil: A Renewable Resource
Soil: A Renewable Resource
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
Matter Cycling in Ecosystems
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Types of Species
Types of Species
Types of Species
Types of Species
Types of Species
81. ANS:
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82. ANS:
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84. ANS:
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97. ANS:
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98. ANS:
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99. ANS:
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100. ANS:
TOP:
A
PTS: 1
DIF: M
Species Interactions: Competition and Predation
D
PTS: 1
DIF: M
Species Interactions: Competition and Predation
A
PTS: 1
DIF: M
Species Interactions: Competition and Predation
C
PTS: 1
DIF: E
Species Interactions: Parasitism, Mutualism, and Commensalism
C
PTS: 1
DIF: E
Species Interactions: Parasitism, Mutualism, and Commensalism
D
PTS: 1
DIF: M
Species Interactions: Parasitism, Mutualism, and Commensalism
B
PTS: 1
DIF: D
Species Interactions: Parasitism, Mutualism, and Commensalism
D
PTS: 1
DIF: E
Species Interactions: Parasitism, Mutualism, and Commensalism
C
PTS: 1
DIF: E
Species Interactions: Parasitism, Mutualism, and Commensalism
D
PTS: 1
DIF: D
Ecological Succession: Communities in Transition
D
PTS: 1
DIF: E
Ecological Succession: Communities in Transition
C
PTS: 1
DIF: E
Ecological Succession: Communities in Transition
D
PTS: 1
DIF: M
Ecological Succession: Communities in Transition
C
PTS: 1
DIF: M
Ecological Succession: Communities in Transition
D
PTS: 1
DIF: M
Ecological Succession: Communities in Transition
B
PTS: 1
DIF: M
Ecological Succession: Communities in Transition
C
PTS: 1
DIF: M
Ecological Succession: Communities in Transition
C
PTS: 1
DIF: E
Ecological Succession: Communities in Transition
A
PTS: 1
DIF: D
Ecological Succession: Communities in Transition
D
PTS: 1
DIF: M
Ecological Stability and Sustainability
ESSAY
101. ANS:
a. Primary productivity (4 points maximum)
*Primary productivity: rate at which autotrophs convert light energy into stored chemical engery
*Increase in oxygen = increase in primary productivity
*Rate of carbon compound formation measured indirectly through oxygen production
*6CO2 + 6H2O--> C6H12O6 + 6O2
*Gross productivity\GPP = rate at which primary producer synthesizes O2
*Net productivity= GPP- producer respiration
b i. Pond water at 25 degrees C vs. pond water at 15 degrees C (4 points max)
*prediction: DO at 15 degrees C greater than DO at 25 degrees C
*Why: saturation DO concentration at 15 degrees is higher than saturation DO concentration at 25
degrees C
*Example
*Higher metabolic rate of aquatic orgnanisms at warmer temperature = less available oxygen
*Fish die in summer ponds/trout live in cold streams
*Drinks at room temperature hold less DO than when cold
*Elaboration of the example
b ii. pond water placed in the dark for 24 hrs vs. pond water placed in the light for 24 hours (4 points max)
* Prediction: DO in light greater than DO in dark
*Why: photosynthesis higher so DO higher
*photosynthesis is light dependent
*light bottle is the NET productivity because both photosynthesis and cellular respiration are
occuring
* dark bottle uses oxygen and respiration only
PTS: 1