Name Class Date. 1. What is at the core of every organism s interaction with the environment?
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1 Name Class Date Section 3-2 Energy Flow (Pages 67-73) Producers 1. What is at the core of every organism s interaction with the environment? 2. What source of energy do organisms use if they don t use the sun s energy? 3. What are autotrophs? 4. Why are autotrophs also called producers? 5. What do autotrophs do during photosynthesis? 6. What is chemosynthesis? 7. Where do bacteria that carry out chemosynthesis live? Consumers (pages 68-69) 8. Heterotrophs are also called? 9. Plant and animal remains and other dead matter are collectively called? 10. Complete the table about the types of heterotrophs. Types of Heterotrophs Type Definition Examples Herbivore Cows, rabbits Heterotroph that eats animals Omnivore Humans, Bears, Crows Detritivore Decomposer Feeding Relationships (Pages 69-71) 11. How does energy flow through an ecosystem?
2 12. Complete the table about feeding relationships. Feeding Relationships Relationship Description Food Chain Food Web 13. What does a food web link together? 14. What is a trophic level? 15. In a food web, what organisms make up the first trophic level? 16. What does a consumer in a food chain depend on for energy? Ecological Pyramids (Pages 72-73) 17. What is an ecological pyramid? 18. Why is it that only part of the energy stored in one trophic level is passed on to the next level? 19. In the space below draw and label two pyramids, an energy pyramid and a biomass pyramid. For the energy pyramid the producers have stored 1500 kilocalories available to the next level, for the biomass pyramid the top consumer has 15 grams of tissue. Each pyramid should have 4 trophic levels. 20. What is biomass? 21. What does a biomass pyramid represent? 22. What does a pyramid of numbers show? 23. Why can each trophic level support only about one tenth the amount of living tissue of the level below it?
3 Section 3-3 Cycles of Matter (Pages 74-80) Introduction (Page 74) 1. What are the four elements that make up over 95 percent of the body in most organisms? Recycling in the Biosphere (Page 74) 2. How is the movement of matter through the biosphere different from the flow of energy? 3. Matter moves through an ecosystem in? 4. What do biogeochemical cycles connect? The Water Cycle (Page 75) 5. Water can enter the atmosphere by evaporating from the leaves of planets in the process of? 6. What are nutrients? 7. What are three nutrient cycles that play especially prominent roles in the biosphere? a. b. c. 8. What are three large reservoirs where carbon is found in the biosphere (finish the sentence? a. As carbon dioxide gas in the-- b. As dissolved carbon dioxide in the-- c. As coal, petroleum, and calcium carbonate rock found-- 9. In what process do plants use carbon dioxide? 10. Why do all organisms require nitrogen? 11. What is nitrogen fixation? 12. What is denitrification? 13. What role does denitrification play in the nitrogen cycle?
4 14. Circle the letter of each sentence that is true about the phosphorus cycle. a. Phosphate is released as rocks and sediments wear down. b. Plants absorb phosphate from the soil or from water. c. Phosphorus is abundant in the atmosphere. d. Organic phosphate cannot move through food webs. 15. Why is phosphorus essential to living things? Nutrient Limitation (Page 80) 16. What is the primary productivity of an ecosystem? 17. If a nutrient is in short supply in an ecosystem, how will it affect an organism? 18. When is a substance called a limiting nutrient? 19. Why do algal blooms occur? Section 4-2 What Shapes an Ecosystem? (Pages 90-97) Biotic and Abiotic Factors (Page 90) 1. Complete the table about factors that influence ecosystems. Factors That Influence Ecosystems Type of Definition Examples Factor Biotic Factors Abiotic Factors 2. What do the biotic and abiotic factors together determine? The Niche (Pages 91-92) 3. What is a niche? 4. In what ways is food part of an organism s niche? Community Interactions (Pages 92-93)
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