1. How Energy Moves Through _________________________
2. The flow of energy controls what two aspects about an ecosystem?
_________________________________________________________________________
_________________________________________________________________________
3. The rate at which organic material is produced by photosynthetic organisms in an ecosystem is called ________________________________________
4. Give three examples of producers: _______________________________________
5. What is a consumer? ____________________________________________________
_________________________________________________________________________
6. The path of energy through the trophic levels of an ecosystem is called a __________________________________
7. What is a herbivore? ___________________________________________________
Give an example _______________________________________________________
8. What is a carnivore? ____________________________________________________
Give an example _______________________________________________________
9. What is an omnivore? __________________________________________________
Give an example _______________________________________________________
10. What is a detritivore? __________________________________________________
Give an example _______________________________________________________
11. Organisms that cause decay are called ___________________________________
12. What is a tertiary consumer? ___________________________________________

13. Use the food web in figure 17-8 to answer the following:

What are the producers in the ecoystem? ________________________
What three organisms eat squid? _______________________________________
Name an organism is an omnivore _______________________
What does a crabeater seal eat? _______________________
Name a tertiary consumer: ______________________________

14. Energy Is Lost in a __________________________
15. During each transfer of energy within an ecosystem,
energy is lost as _____________

16. The amount of useful energy [increases | decreases | stays the same ] as it passes through an ecosystem.
17. ___________________ is a diagram in which each trophic level is represented by a block.
18. Most ecosystems only have three or four trophic levels. Why is more than four levels never seen? __________________________________________________________
_________________________________________________________________________

19. Look at figure 17-10 to answer true or false to the following statements.
______ It is more efficient to eat plants than animals.
______ It takes 10x more grain to feed one cow to make enough beef to feed a human.
______ The earth could support more vegetarian humans than meat-eaters.

20. What is biomass? ________________________________________________________
_________________________________________________________________________

21. Use arrows to connect the following organism in a food web.