Unit 3 lesson 1 food chains


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Unit 3 lesson 1 food chains

  1. 1. Unit 3 EcosystemsChapter 6 & 7
  2. 2. Part 1 The Web Of Life p. 92 & Food Relationships p. 93Questions #3-9 in the book
  3. 3. Define EcosystemEcosystem = the network of relationships(interactions) among living (plants, animals) andthe non-living parts (soil, climate, water etc.) in anenvironment.
  4. 4. Differentiate the terms producers, consumersdecomposers. P. 93 Other examples: Grasses Trees shrubs Water lilies Flowers Vegetables Fruits Producer = a plant which can synthesize carbohydrates using carbon dioxide and the sun’s energy. Actually “produce” their own food and food for the rest of the ecosystem
  5. 5. Differentiate the terms producers, consumers,decomposers. P. 93 Consumers = All those organisms that have to eat (consume) plants or animals to obtain their food.
  6. 6. Types of consumersPrimary Consumers: Animals that eatproducers. Also called 1st. order consumers.(Ex. Rabbit, squirrels, grouse, insects)Secondary Consumers: Animals that eatprimary consumers. Also called 2nd. orderconsumers. (fox, owl, mink )Tertiary Consumers: Animals that eatsecondary consumers. Also called 3 rd. orderconsumers. (Wolf, coyote, hawk)
  7. 7. Differentiate the terms producers, consumers,decomposers. P. 94 Examples: Worms Bacteria Fungi Protozoa• Decomposers = Simple organisms that obtain their food from dead/decaying organisms and wastes.
  8. 8. Differentiate the terms food chain & foodweb. P. 94Food chain = linear Food web = a seriessequence of interconnectingrepresenting the food chains in annutrition of various ecosystem.species Food web is morefrom the simplest complex and isplant to the top composed of severalcarnivore. food chains Food web is a more realistic picture of an ecosystem.
  9. 9. Food Chain vs Food Web
  10. 10. Identify ALL examples of each trophic level. Producers Shrubs, grass, trees Primary Consumers Grasshopper, rabbit, deer, squirrel Secondary Consumers Mountain lion, snake, shrew, insect-eating bird, hawk Tertiary Consumers Hawk, snake, mountain lion Decomposers Bacteria, fungi
  11. 11. Give an exampleof a food chainfrom fig. 6.4. P.95Tree insect insect eating hawk → → bird →Producer Primary 2nd order 3rd order consumer consumer consumerNote: The arrows indicate the flow of energy & nutrients from one level to the next
  12. 12. Sample Food Chain
  13. 13. Draw an example of a food webcontaining humans. P. 94 Mosquito Hawk Cow Grass Man Decomposer Phytoplankton Fish
  14. 14. Draw an example of a food web containinghumans. P. 94 Hawk Mosquito Cow Man fish Grass Decomposer Phytoplankton
  15. 15. What happens to energy? (Handout)
  16. 16. What happens to energy?85-90% is LOST 10-15% is or USED up: stored: Available or maintaining transferred to the organism other animals (Ex. when it is metabolism, eaten. reproduction etc.) And as heat!!! IF NOT EATEN: Energy is transferred to the decomposers .
  17. 17. What happens to the energy at the decomposer level?Same thing….ALMOST !?Most is lost or used up through heat and maintainingthe organism.If eaten (Ex. A mushroom) energy gets passed on.HOWEVER, once a decomposer dies….The energy is LOST FOREVER!!!
  18. 18. Summary – Energy & Food WebsThe ultimate source of energy (for most ecosystems) is thesunThe ultimate fate of energy in ecosystems is for it to be lostas heat, metabolism, reproduction, etc..Energy and nutrients are passed from organism toorganism through the food chain as one organism eatsanother.Decomposers remove the last energy from the remains oforganisms.Inorganic nutrients are cycled, energy is not.
  19. 19. Summary – Energy & Food WebsQuestion #14, 15 & #16 p. 98 make perfect reviewquestions for the test.