{{asɛmtiNe Ɔkyerɛwfo}} | Nhomakorabea | Nneɛma a ɛma wotumi yɛ ade

1

Which of the following most directly explains the periodic fluctuations of the curve?

Daily variations in air temperature

Seasonal variations in photosynthetic activity

Seasonal variations in ocean water temperature

Daily variations in sea level

1

Which of the following is most likely a significant cause of the general trend indicated by the graph?

Reduction of ozone concentrations in the upper atmosphere

Increase in consumption of fossil fuels

Increase in evaporation of ocean water

Reduction in size of polar ice caps

1

Which of the following is true of carbon as it cycles in nature?

The CO₂ concentrations in the atmosphere is reduced by cutting trees

Carbon dioxide is released during photosynthesis

Carbon reservoirs include forests and oceans

Carbon compounds rarely exist in the gaseous state

1

Which of the following elements is most likely to limit primary production in freshwater lakes?

Phosphorus

Calcium

Carbon

Oxygen

1

Which of the following diagrams correctly illustrates the nitrogen cycle?

null

1

Which of the following best describes soil in many tropical rain forests?

They are deep and well drained

They are quickly depleted of nutrients when the forest is removed

They are similar to soils in grasslands

They lack soil horizons

1

The ultimate source of energy for terrestrial ecosystems is

Nutrients in vegetation

The sun

Nutrients in soil

Primary consumers

1

The two major processes involved in the carbon cycle are

Photosynthesis and respiration

Weathering and erosion

Evaporation and transpiration

Fixation and denitrification

1

The process in the hydrologic cycle in which water vapor is released from leaves into the atmosphere is called

Sublimation

Infiltration

Transpiration

Percolation

1

The net annual primary productivity of a particular wetland ecosystem is found to be 8,000 kcal/m² per year. If respiration by the aquatic producers is 12,000 kcal/m² per year, what is the gross annual primary productivity for this ecosystem, in kcal/m² per year?

20,000

4,000

8,000

12,000

1

The major biological source of dissolved oxygen in the ocean comes from

Oxidation of sulfur by bacteria in ocean vent communities

Decomposition of organic sediments on the ocean floor

Metabolic processes of coral in reefs

Photosynthesis by phytoplankton

1

The greatest amount of freshwater is found in which of the following?

Rivers and streams

The atmosphere

Estuaries

Polar ice caps and glaciers

1

Losses of usable energy between successive trophic levels in an ecosystem are best accounted for by which of the following?

The second law of thermodynamics

The first law of thermodynamics

The law of conservation of matter

Limiting factors in the ecosystem

1

How does the burning of fossil fuels contribute to the net increase in atmospheric carbon?

Carbon that has been sequestered underground is added to the carbon cycle, cycling between the atmosphere and the biosphere

Carbon released by the burning is not in a form that can be readily absorbed by plants, leaving residual carbon in the atmosphere

Carbon released by the burning is more easily absorbed in the atmosphere than that produced by natural means

Carbon released by the burning increases plant growth, producing more carbon for the atmosphere

1

Which of the following exemplifies when legumes fix nitrogen into the soil with help from bacteria and the bacteria receive nutrients from the legume plant?

Competition

Commensalism

Parasitism

Mutualism

1

Which of the following exemplifies when moss grows on a tree trunk in a forest so it can receive light and moisture but the tree is unaffected?

Commensalism

Parasitism

Competition

Mutualism

1

Which of the following exemplifies when ticks feed on a deer?

Mutualism

Parasitism

Commensalism

Competition

1

A field is abandoned, and an invasive plant that can live in nutrient-poor soil moves into the field. If the land is later cleared of this invasive species and it is discovered that the soil has an abundance of nitrogen compounds, what conclusion can best be made?

The plants used up all of the phosphorus and potassium and left the nitrogen behind

More rock was weathered and broken down to release nitrogen compounds

Primary succession always produces an abundance of nitrogen

Bacteria in soil and root nodules converted free nitrogen into nitrogen compounds

1

Which of the following best describes gross primary productivity in an ecosystem?

Gross primary productivity is the total amount of energy captured by producers plus the energy used by consumers over time.

Gross primary productivity is the total amount of energy lost as heat during energy transfer between trophic levels.

Gross primary productivity is the total amount of energy captured by producers minus the energy that producers respire over time.

Gross primary productivity is the total amount of solar energy captured by producers through photosynthesis over time.

1

Phytoplankton are most abundant in the upper few hundred feet of most bodies of water because

Sunlight does not penetrate to great depths in water

They can most readily hide from predators there

They feed on zooplankton, which are found only in the top layers of water

As primary producers, they must be accessible to many other organisms

1

Which of the following describes the process where plant roots absorb ammonium ions and nitrate ions for use in making molecules such as DNA, amino acids, and proteins?

Nitrification

Nitrogen fixation

Denitrification

Assimilation

1

Which environment is characterized by the highest diversity of tree species?

null

1

Which environment is most likely to be characterized by dry scrub with frequent fires?

null

1

Which of the following best helps to explain why phosphorus is often a limiting factor in many ecosystems?

Phosphate is not readily taken up by plants

There is usually a gaseous phase in the phosphorus cycle

Under many conditions, phosphorus forms stable insoluble compounds (rocks)

Phosphorus cycles very quickly through environments

1

Of the following organisms, which occupies the lowest trophic level?

Hawk

Snake

Deer

Spider

Unit 1 Ecosystems MCQ

Unit 1 Ecosystems MCQ

Which of the following most directly explains the periodic fluctuations of the curve?

Which of the following is most likely a significant cause of the general trend indicated by the graph?

Which of the following is true of carbon as it cycles in nature?

Which of the following elements is most likely to limit primary production in freshwater lakes?

Which of the following diagrams correctly illustrates the nitrogen cycle?

Which of the following best describes soil in many tropical rain forests?

The ultimate source of energy for terrestrial ecosystems is

The two major processes involved in the carbon cycle are

The process in the hydrologic cycle in which water vapor is released from leaves into the atmosphere is called

The net annual primary productivity of a particular wetland ecosystem is found to be 8,000 kcal/m2 per year. If respiration by the aquatic producers is 12,000 kcal/m2 per year, what is the gross annual primary productivity for this ecosystem, in kcal/m2 per year?

The major biological source of dissolved oxygen in the ocean comes from

The greatest amount of freshwater is found in which of the following?

Losses of usable energy between successive trophic levels in an ecosystem are best accounted for by which of the following?

How does the burning of fossil fuels contribute to the net increase in atmospheric carbon?

Which of the following exemplifies when legumes fix nitrogen into the soil with help from bacteria and the bacteria receive nutrients from the legume plant?

Which of the following exemplifies when moss grows on a tree trunk in a forest so it can receive light and moisture but the tree is unaffected?

Which of the following exemplifies when ticks feed on a deer?

A field is abandoned, and an invasive plant that can live in nutrient-poor soil moves into the field. If the land is later cleared of this invasive species and it is discovered that the soil has an abundance of nitrogen compounds, what conclusion can best be made?

Which of the following best describes gross primary productivity in an ecosystem?

Phytoplankton are most abundant in the upper few hundred feet of most bodies of water because

Which of the following describes the process where plant roots absorb ammonium ions and nitrate ions for use in making molecules such as DNA, amino acids, and proteins?

Which environment is characterized by the highest diversity of tree species?

Which environment is most likely to be characterized by dry scrub with frequent fires?

Which of the following best helps to explain why phosphorus is often a limiting factor in many ecosystems?

Of the following organisms, which occupies the lowest trophic level?

Which of the following most directly explains the periodic fluctuations of the curve?

Which of the following is most likely a significant cause of the general trend indicated by the graph?

Which of the following is true of carbon as it cycles in nature?

Which of the following elements is most likely to limit primary production in freshwater lakes?

Which of the following diagrams correctly illustrates the nitrogen cycle?

Which of the following best describes soil in many tropical rain forests?

The ultimate source of energy for terrestrial ecosystems is

The two major processes involved in the carbon cycle are

The process in the hydrologic cycle in which water vapor is released from leaves into the atmosphere is called

The net annual primary productivity of a particular wetland ecosystem is found to be 8,000 kcal/m2 per year. If respiration by the aquatic producers is 12,000 kcal/m2 per year, what is the gross annual primary productivity for this ecosystem, in kcal/m2 per year?

The major biological source of dissolved oxygen in the ocean comes from

The greatest amount of freshwater is found in which of the following?

Losses of usable energy between successive trophic levels in an ecosystem are best accounted for by which of the following?

How does the burning of fossil fuels contribute to the net increase in atmospheric carbon?

Which of the following exemplifies when legumes fix nitrogen into the soil with help from bacteria and the bacteria receive nutrients from the legume plant?

Which of the following exemplifies when moss grows on a tree trunk in a forest so it can receive light and moisture but the tree is unaffected?

Which of the following exemplifies when ticks feed on a deer?

A field is abandoned, and an invasive plant that can live in nutrient-poor soil moves into the field. If the land is later cleared of this invasive species and it is discovered that the soil has an abundance of nitrogen compounds, what conclusion can best be made?

Which of the following best describes gross primary productivity in an ecosystem?

Phytoplankton are most abundant in the upper few hundred feet of most bodies of water because

Which of the following describes the process where plant roots absorb ammonium ions and nitrate ions for use in making molecules such as DNA, amino acids, and proteins?

Which environment is characterized by the highest diversity of tree species?

Which environment is most likely to be characterized by dry scrub with frequent fires?

Which of the following best helps to explain why phosphorus is often a limiting factor in many ecosystems?

Of the following organisms, which occupies the lowest trophic level?

The net annual primary productivity of a particular wetland ecosystem is found to be 8,000 kcal/m² per year. If respiration by the aquatic producers is 12,000 kcal/m² per year, what is the gross annual primary productivity for this ecosystem, in kcal/m² per year?

The net annual primary productivity of a particular wetland ecosystem is found to be 8,000 kcal/m² per year. If respiration by the aquatic producers is 12,000 kcal/m² per year, what is the gross annual primary productivity for this ecosystem, in kcal/m² per year?