# Assessment 3.3

Páginas: 4 (835 palabras) Publicado: 11 de noviembre de 2010
3.3 Assessment
1.
a. Review. Energy is said to flow in a ‘‘one-way stream’’ through an ecosystem. In your own words, describe what that means.
That the energy only goes in one way, it would neverreturn because the energy is not renewable.
b. Form a Hypothesis. Explain what you think might happen to a Everglades ecosystem shown in figure 3-9 if there were a sudden decrease in the number ofcrayfish?
The food chain will lose it balance because the species will start disappearing. The predators wouldn’t have anything to eat so they will die. And after they die maybe some prays thatsurvived they will overpopulate the world so the food chain would not be balance.
2.
a. Review. On average, what proportion of the energy in an ecosystem is transferred from one tropical level to thenext? Where does the rest of the energy go?
About the 10% and the rest go to the environment, also the heat goes to the environment.
b. Calculate. Draw an energy pyramid for a five-step food chain. If100 percent of the energy is available at the first trophic level, what percentage of that energy is available at the highest trophic level?
3.
Apply the Big idea. Interdependence In nature. Referto figure 3-9, which shows a food web in the Everglades. Choose one of the food chains within the web. Then, write a paragraph describing the feeding relationships among the organisms in the foodchain.
The algae feed the zooplankton that are found in the water and that are herbivores, after the zooplankton is swimming through the water its predator the plankton-eating fishes eat them, they arealso in the water and they are the in the first-level of the carnivores, after this what comes in the food chain is the heron that eats the plankton-eating fishes.
3.4 Assessment
1.
a. Review. Howdoes the way that matters flows trough an ecosystem differ from the way that energy flows?
The matter return because when a organism die the decomposers make their job and decompose the dead body...

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