ecology help


Ch. 18 – Ecology

  1. List several biotic and abiotic components of an ecosystem. Page 363
  2. The maintenance of a self-sustaining ecosystem requires what? Page 362
  3. Define producers. Page 366
  4. In going from one trophic level to the next, what happens to the energy available? Does it increase or decrease? Page 369
  5. Name the parts of the water cycle. Page 371
  6. If hawks were to hunt snakes to near extinction, what would happen to the rest of the ecosystem? Think about the prey population (mice that snakes usually eat) and the predator population (hawks).
  7. What is a decomposer? Give 2 examples.
  8. What is a biogeochemical cycle? List the four cycles briefly and describe each one.  Pages371-374
  9. If lots of hot water were dumped into a lake, what would happen to the amount of oxygen available to the fish? Hint: Hint removes the amount of oxygen from water.
  10. How much of the total energy is transferred from one energy level to the next in an energy pyramid? page 369
  11. The producers in an ecosystem produce 25,000,000 kilocalories per year. How much energy is most likely available to the organisms in Level 2 of the pyramid? Remember that only 10% of the energy is passed on to each level. Page 366
  12. How many levels can there be in an energy pyramid? Why?
  13. What is a consumer? Give three examples. Page 367
  14. What’s the difference between a food chain and a food web? Draw an example of each. Page 368