Ecosystem Cycles

Ecosystem Cycles

Which chemical form is dominant in the phosphorus cycle?

“Phosphate ion” for which chemical form is dominant in the phosphorus cycle. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Rates depend on temperature, moisture, substrate quality, consumer physiology, and the elemental balance between organisms and their food. These controls explain why the same process can differ among terrestrial, freshwater, and marine systems without changing its definition. The remaining alternatives—“Phosphine gas”, “Elemental phosphorus”, “Phosphoric acid”—refer to diffe

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 18

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Ecosystem Cycles

In the nitrogen cycle, what happens during fixation?

“Nitrogen gas to ammonia” for in the nitrogen cycle, what happens during fixation. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. The relevant inference should follow the pathway from resource supply to organismal uptake and then to ecosystem-level flux. Productivity, trophic transfer, decomposition, and nutrient regeneration are connected, but each measures a different part of that pathway. The remaining alternatives—“Nitrate to nitrogen gas”, “Ammonia to nitrate”, “Nitrite to ammonia”—refer to

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 18

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Ecosystem Cycles

Which biogeochemical cycle is open due to loss to oceans?

“Phosphorus” for which biogeochemical cycle is open due to loss to oceans. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. The relevant inference should follow the pathway from resource supply to organismal uptake and then to ecosystem-level flux. Productivity, trophic transfer, decomposition, and nutrient regeneration are connected, but each measures a different part of that pathway. The remaining alternatives—“Carbon”, “Nitrogen”, “Sulfur”—refer to different states, processes, or scales and ther

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 18

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Ecosystem Cycles

Which organism group performs nitrification?

“Bacteria” for which organism group performs nitrification. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Rates depend on temperature, moisture, substrate quality, consumer physiology, and the elemental balance between organisms and their food. These controls explain why the same process can differ among terrestrial, freshwater, and marine systems without changing its definition. The remaining alternatives—“Fungi”, “Algae”, “Protozoa”—refer to different states, processes, or scales and therefore

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 18

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Ecosystem Cycles

What process describes nutrients settling and locking into ocean sediments?

“Sedimentation” for what process describes nutrients settling and locking into ocean sediments. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Rates depend on temperature, moisture, substrate quality, consumer physiology, and the elemental balance between organisms and their food. These controls explain why the same process can differ among terrestrial, freshwater, and marine systems without changing its definition. The remaining alternatives—“Leaching”, “Respiration”, “Immobilization”—refer to d

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 18

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Ecosystem Cycles

Denitrification requires what condition?

“Anaerobic” for denitrification requires what condition. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Rates depend on temperature, moisture, substrate quality, consumer physiology, and the elemental balance between organisms and their food. These controls explain why the same process can differ among terrestrial, freshwater, and marine systems without changing its definition. The remaining alternatives—“Aerobic”, “Sunlight”, “Cold temperature”—refer to different states, processes, or scales and

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 18

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Ecosystem Cycles

The largest reservoir of phosphorus is found in:

“Rocks and sediments” for the largest reservoir of phosphorus is found in. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Rates depend on temperature, moisture, substrate quality, consumer physiology, and the elemental balance between organisms and their food. These controls explain why the same process can differ among terrestrial, freshwater, and marine systems without changing its definition. The remaining alternatives—“Atmosphere”, “Ocean”, “Plants”—refer to different states, processes, or sc

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 18

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Ecosystem Cycles

Which element’s overabundance causes algal blooms and fish kills?

“Phosphorus” for which element’s overabundance causes algal blooms and fish kills. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Ecosystem processes are constrained by energy conservation and by the cycling of matter. Energy enters mainly through primary production, is lost as metabolic heat at every transfer, and therefore cannot be recycled in the way that carbon, nitrogen, phosphorus, or water can. The remaining alternatives—“Carbon”, “Sulfur”, “Nitrogen”—refer to different states, processes,

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 18

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Ecosystem Cycles

The conversion of organic nitrogen into ammonium is known as:

“Ammonification” for the conversion of organic nitrogen into ammonium is known as. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Rates depend on temperature, moisture, substrate quality, consumer physiology, and the elemental balance between organisms and their food. These controls explain why the same process can differ among terrestrial, freshwater, and marine systems without changing its definition. The remaining alternatives—“Nitrification”, “Denitrification”, “Assimilation”—refer to differe

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 18

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Ecosystem Cycles

Sedimentary biogeochemical cycles have their main pool in:

“Soil and rocks” for sedimentary biogeochemical cycles have their main pool in. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Rates depend on temperature, moisture, substrate quality, consumer physiology, and the elemental balance between organisms and their food. These controls explain why the same process can differ among terrestrial, freshwater, and marine systems without changing its definition. The remaining alternatives—“Atmosphere”, “Living biomass”, “Ocean surface”—refer to different sta

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 18

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Ecosystem Cycles

Which form of nitrogen is directly absorbed by plants?

“Nitrate” for which form of nitrogen is directly absorbed by plants. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Ecosystem processes are constrained by energy conservation and by the cycling of matter. Energy enters mainly through primary production, is lost as metabolic heat at every transfer, and therefore cannot be recycled in the way that carbon, nitrogen, phosphorus, or water can. The remaining alternatives—“Nitrogen gas”, “Ammonia”, “Nitrite”—refer to different states, processes, or scal

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 18

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Ecosystem Cycles

The oxidation of ammonium ions is part of:

“Nitrification” for the oxidation of ammonium ions is part of. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Ecosystem processes are constrained by energy conservation and by the cycling of matter. Energy enters mainly through primary production, is lost as metabolic heat at every transfer, and therefore cannot be recycled in the way that carbon, nitrogen, phosphorus, or water can. The remaining alternatives—“Fixation”, “Denitrification”, “Mineralization”—refer to different states, processes, or

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 18

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