Student Exploration - Food Chain - GIZMOs [ALL correct ANSWERS] Rated A

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Student Exploration: Food Chain Prior Knowledge Questions (Do these BEFORE using the Gizmo.) The Food Chain Gizmo™ shows a food chain with hawks, snakes, rabbits, and grass. In this simulation, t... he hawks eat snakes, the snakes eat rabbits, and the rabbits eat grass. 1. Producers are organisms that do not need to eat other organisms to obtain energy. A. Which organism is a producer in this food chain? [ The grass ] B. Where does the producer get its energy? [ The sun ] 2. Consumers must eat other organisms for energy. Which organisms are consumers in this food chain? [ The rabbit, snakes, and the hawk. ] Gizmo Warm-up The SIMULATION pane of the Gizmo shows the current population, or number, of each organism in the food chain. 1. What are the current populations of each organism? Grass: [ 27300 ]Rabbits: [ 2566 ]Hawks: [ 278 ]Snakes: [ 42 ] 2. Select the BAR CHART tab, and click Play ( ). What do you notice about each population as time goes by? [ Some of the species decrease in % of balance ] If populations don’t change very much over time, the ecosystem is in equilibrium. 3. Compare the equilibrium populations of the four organisms. Why do you think populations decrease at higher levels of the food chain? [ Because they depend on the lower parts of the food chain to survive.] [Show More]

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