Energy and Food Webs
What trophic level contains the most energy in an energy pyramid?
A. cellular respiration
B. photosynthesis
C. organism decay
D. factory emissions
What is B. photosynthesis?
The diagram labels "nitrogen-fixing bacteria." What form of nitrogen do these bacteria convert atmospheric N₂ into?
What is NO3?
On the diagram, which process breaks rocks to release phosphate into the soil?
What is weathering?
On the diagram, water evaporates from a lake and from tree leaves. Label the term that describes evaporation from leaves.
What is transpiration?
Approximately what percentage of energy is passed from one trophic level to the next?
What is 10%?
List two ways, that plants are part of the carbon cycle.
What is photosynthesis and respiration?
Using the diagram, which of the following organisms helps to fix nitrogen?
A. Plants
B. Decomposers
C. Animals
D. Bacteria
What is D. Bacteria?
Using the diagram, how do plants get phosphorus?
A. leaching
B. geological uplift
C. absorption through roots
D. weather
What is C. absorption through roots?
The diagram shows water vapor cooling into tiny droplets on grass in the morning. What process is this?
What is condensation?
Which of the following is an example of a producer?
A. grass
B. algae
C. Bacteria
D. all of the above
What is D. all of the above?
According to the diagram, which process removes CO₂ from the atmosphere and stores it as organic carbon in plants?
What is photosynthesis?
In the diagram, which process converts ammonium (NH₄⁺) into nitrites and nitrates? Name the organisms responsible.
What is nitrification by nitrifying bacteria.
Using the diagram, what are two ways that phosphorus gets into water?
A. leaching and runoff
B. leaching and geological uplift
C. weathering and geological uplift
D. weathering and absorption
What is A. leaching and runoff?
The diagram shows ice turning directly into water vapor on a sunny slope. What is this process called?
What is sublimation?
Energy from the sun enters an ecosystem when autotrophs use sunlight to make sugar molecules, what is this process called?
What is photosynthesis?
The diagram shows factories and vehicles releasing gases. Name this process.
What is combustion?
Using the diagram, which process allows nitrogen to be absorbed into plants?
A. assimilation
B. ammonification
C. denitrification
D. nitrification
What is A. Assimilation?
Identify from the diagram one place phosphorus is stored long-term (a reservoir).
What is the underwater phosphate reserve OR the underground phosphate reserve?
Using the diagram, explain the difference between infiltration and runoff.
What is "infiltration" is water entering the soil (shown as arrows into ground); "runoff" is surface flow into streams (shown as arrows overland to water bodies).
Using the energy pyramid concept, calculate and explain the percent energy remaining at the third-level consumer if producers start with 10,000 J of energy.
What is 10 J?
Using the diagram, list two ways carbon returns to the atmosphere from living organisms.
What is "respiration" and "decomposition"?
Using the full diagram, identify one pathway by which nitrogen returns to the soil from dead organisms as shown.
The diagram shows phosphate fertilizer running into a stream. What two processes illustrated move phosphorus into aquatic systems?
What is leaching and runoff?
BONUS: In a food web, predict one likely effect of removing a top predator and explain the cascade effect.
DOUBLE POINTS
What is the prey population will increase?