Square #1 Define each of the following: Biotic Factor Abiotic Factor Limiting Factor Carrying Capacity = living factors = nonliving factors = factors influencing population numbers = maximum population supported by an environment

Square #2 Chose one, 4-organism food chain from this food web and write the names of the organisms using arrows to show energy flow Label the organisms as producers, primary, secondary, and tertiary consumers.

Square #3 1 10 100 1,000 Producer Primary Consumer The pyramid at the right represents energy. Label each level with the name and type of organism from your food chain. If 10% of the total energy consumed is incorporated into the next level, write the amount of energy in each level if the bottom level starts at 1000 calories. Tertiary Consumer 1 Secondary Consumer 10 Primary Consumer 100 Producer 1,000

Square #4 What happens to the energy as you go up the pyramid? Why? 1 The 10% Rule: Tertiary Consumer 1 Organisms lose energy as they…grow, eat, move, etc. ENERGY Secondary Consumer 10 Primary Consumer 100 The energy is turned into heat energy and is lost to the environment! Producer 1,000

EXTENSION QUESTION! A pyramid is a good shape for the energy flow diagram because it shows the reduced calories available at each trophic level… What else do you think gets reduced as you work your way through the trophic levels?

Square #5 List the biotic and abiotic factors in this forest ecosystem

Square #6 List five factors that would be limiting factors in this forest ecosystem

Squares #7 + #8 Answer the following questions in complete sentences: Predict what would happen to the members of the food chain if pollution from factories killed significant numbers of the primary consumers. Predict what would happen if a better-adapted secondary consumer were to move into the ecosystem. If humans built homes that decreased the habitat of this ecosystem, how would the carrying capacity be affected? Why? Draw food chains on the board: producer primary consumer  secondary consumer  tertiary consumer

Exit Ticket BCR Interdependence in nature is illustrated by the transfer of energy through trophic levels. Use the forest food chain you developed to answer the following: Explain how energy is obtained at each trophic level by the different organisms (consumer, producer, etc). Describe the efficiency of energy transfer between trophic levels and discuss how the amount of energy available at each trophic level affects the structure of the ecosystem. If the plant material contained a commercially produced toxin, what would be the likely effects of this toxin on this food web? Explain.