Food Chains, Webs & Pyramids

_______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.

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

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

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

ecosystem.

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

Whether you are analyzing a food chain or a food web………..

The Arrow ( )represents the amount of energy transferred!

On the food webs to the right…...1. Circle the producers. 2. A primary consumer eats producers3. 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.

8. Complete the following table based on the information in the 1st food web.

Organism Obtains its energy from:

RaccoonWolvesMiceSnakesDeer

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

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

12. Number the trophic levels of the pyramid

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

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

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

Practice TAKS Question

In this food pyramid, which level contains the greatest amountof energy? A Tertiary consumersB Secondary consumersC Primary consumersD Producers

Practice TAKS Question

In this diagram of a marine food web, which term describes the sea turtles (Grade 11 2006F; B.12E,)?A Aquatic herbivoresB Autotrophic producersC Third-level consumersD Primary decomposers

Practice TAKS Question

In this food chain, the spiders are — (Grade 10 2003; B.12-E)A producersB primary consumersC competitorsD secondary consumers

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 1G Group 2H Group 3J Group 4