1. Food Chains, Webs & Pyramids

2. _______factors in an ecosystem are factors that are living. ________factors in an ecosystem are factors that are not living (i.e. water, soil, air etc.) If you do not know the above terms, write them on the back of your student sheet.

3. _________(also called autotrophs) make their own food. __________(also called heterotrophs) obtain their food from consuming different organisms

5. ________ are organisms that feed by breaking down and absorb nutrients from dead organisms. (examples: Bacteria, fungi)

6. A _________is a simple model that show how matter and energy move through an ecosystem.

7. A ________is a model that shows all of the possible feeding relationships at each trophic level in a community.

8. Whether you are analyzing a food chain or a food web……….. The Arrow ( )represents the amount of energy transferred!

9. On the food webs to the right…... 1. Circle the producers. 2. A primary consumer eats producers 3. Put a 1 on the primary consumers. 4. A secondary consumer eats primary producers. 5. Put a 2 on the secondary consumers. 6. A tertiary consumer eats secondary consumers. 7. Put a 3 on the tertiary consumers.

10. 8. Complete the following table based on the information in the 1 st food web. OrganismObtains its energy from: Raccoon Wolves Mice Snakes Deer

11. 10. In the 2 nd food web, would there be more: Hawks or Snakes? _____________ Mouse or berry bushes? _____________ Explain your answer to #10 according to the flow of energy:

12. 11. What would the X represent in the food web diagram below?

13. 12. Number the trophic levels of the pyramid

14. 10% Rule:10 % of available energy in an ecological pyramid is transferred to the next trophic level. The remaining energy is given off as heat (thermal energy) Heat

15. 13. According the pyramid, trophic level 2 has 376 kilocalories of energy. Write in the amounts of energy the remaining trophic levels would have. (Hint: use 10% rule) 376 kcal

16. 14. What happens to the remaining energy that is not used at each trophic level?

17. Practice TAKS Question In this food pyramid, which level contains the greatest amount of energy? A Tertiary consumers B Secondary consumers C Primary consumers D Producers

18. Practice TAKS Question In this diagram of a marine food web, which term describes the sea turtles (Grade 11 2006F; B.12E,)? A Aquatic herbivores B Autotrophic producers C Third-level consumers D Primary decomposers

19. Practice TAKS Question In this food chain, the spiders are — (Grade 10 2003; B.12-E) A producers B primary consumers C competitors D secondary consumers

20. Practice TAKS Question The table lists four groups of factors found in a particular ecosystem. Which group consists of only abiotic factors? (Grade 11 2004J; B.12-E) F Group 1 G Group 2 H Group 3 J Group 4