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Section 3.3 Energy Flow in Ecosystems
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DO NOW REBUS PUZZLES ON THE BOARD
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Last Night’s homework Read Section 3.3 and define: Food chain
Phytoplankton Food web Zooplankton Trophic level Ecological pyramid Biomass
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Homework Pg. 78 Answer questions 1a, 1b, 2a & 2b in the Section 3.3 Assessment
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Primary producers – give an example?
REVIEW Primary producers – give an example? Grass, trees, bushes – anything that produces its own food. Typically through photosynthesis. Known as Autotrophs Store energy in forms that other organisms can use when eaten
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Consumers aka Heterotrophs
REVIEW Consumers aka Heterotrophs You are one, you rely on eating off of something else even if you are a vegetarian. Some are specialized – Lions only eat meat. Others are generalized – bears can eat fish or plants / berries.
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Chemosynthesis with equation
REVIEW Chemosynthesis with equation
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NEW MATERIAL FOOD CHAIN – series of steps in which organisms transfer energy by eating and being eaten. Primary Producer Herbivore Carnivore (pg. 73) FOOD WEB – Network of feeding interactions Herbivores graze on different types of grass Carnivores feed on different herbivores (pg. 74)
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FOOD CHAINS One-way stream Food chains vary in length
Primary producer various consumers Food chains vary in length As little as 2 steps but could be much larger
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ACTIVITY! Find a partner
Write a story starting from a primary producer. The story should be written so that there are at least 3 animals involved Trade stories with partner and partner draws the food chain at the bottom of the page Most creative story wins a prize
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Food web More complex than a single, simple chain
Herbivores graze on several types of grasses, and carnivores or omnivores eat herbivores. Why are food chains a more accurate representation of the feeding relationship?
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Homework Pg. 78 Answer questions 1a, 1b, 2a & 2b in the Section 3.3 Assessment
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