The first organism in a food chain is typically .
In an energy pyramid, which level has the most available energy?
A biomass pyramid of an ecosystem is shown.
Which statement provides the best explanation for the difference in biomass of organisms found at each trophic level?
The energy pyramid below shows the energy made available by producers.
Based on the energy flow between trophic levels in an energy pyramid, how much energy would be expected to be found at the secondary consumer level in this pyramid?
The energy pyramid below shows the energy made available by producers.
Based on the energy flow between trophic levels in an energy pyramid, how much energy would be expected to be found at the primary consumer level in this pyramid?
The movement of energy in an ecosystem can be shown by an energy pyramid. An energy pyramid shows the amount of energy available at each level of a food chain. A food chain is made up of grain plants, mice, snakes, and hawks.
Which of the following diagrams correctly represents the energy available at each level in this food chain?
Use the answer choices on the image above.
In the model above, if the population of rabbits increases, what will happen to the population of grass over time? Explain your reasoning.
Stem:
The grass population would (increase/decrease/not change) because ___________.
A marine ecosystem is represented below.
What is lost to the environment at each of the trophic levels of this ecosystem?
A disease comes through and kills off the grain in this ecosystem.
Which organisms would be affected by this change and why?
A partial Texas food web is shown.
The populations of which organisms will most likely increase as a result of a disease that suddenly reduced the population of Texas horned lizards?
A terrestrial food web is shown below.
Which of the following lists only organisms that are secondary consumers in this food web?
Oil spills in the ocean affect marine food webs. Animals that are initially affected by oil spills include sea otters, seabirds, and other organisms that spend most of their time on the ocean surface.
Based on the food web, how would a significant decrease in the sea otter population due to an oil spill most likely affect this ecosystem?
Select all producers from this food web.
Select all primary consumers from this food web.
Which organism in this food web is both a secondary and tertiary consumer?
