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Weimer_Rachel_2.2foodchain.pdf
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Exam of 7 pages for the course NURSING at NURSING (Weimer_Rachel_)
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Student Exploration: Food Chain
Vocabulary (refer to vocab file located on the Gizmo site for definitions): consumer,
ecosystem, energy pyramid, equilibrium, food chain, population, predator, prey,
producer
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, the 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 provides food
for the other organism.
B. Where does the producer get its energy? The producer receives its energy
from photosynthesis.
2. Consumers must eat other organisms for energy. Which organisms are consumers
in this food chain? The rabbit, snakes and hawks.
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?
Hawks: 34
Snakes: 230
Rabbits: 2070
Grass:
2. Select the BAR CHART tab, and click Play ( ). What do
you notice about each population as time goes by? Each
organism changes slightly.
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If populations don’t change very much over time, the ecosystem is in equilibrium.
3. Notice the populations decrease as you go from the bottom of the food chain to the
top. Why do you think this is so? Grass is easier to grow and obtain while hawks
need more.
This diagram, showing decreasing populations at each level, is called an energy
pyramid.
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