1. Science Starter— Food Chains, Food Webs, and Energy Pyramids
Label the following as food chain, food web or energy pyramid
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2. Energy Flow Through an Ecosystem
Food Chains, Food Webs, Energy Pyramids
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Organisms that can store chemical energy in glucose during photosynthesis are called PRODUCERS.
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Plants are producers (autotrophs) which use most of the energy they make for themselves.
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Producers use cellular respiration to supply the energy they need to live.
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6. 6 O2 + C6H12O6 -->  6 H2O + 6 CO2 + energy (ATP)
CELLULAR RESPIRATION is the chemical reaction that releases the energy from the glucose organic compound.
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The energy that is not used by producers can be passed on to organisms that cannot make their own energy.
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Organisms that cannot make their own energy are called CONSUMERS or heterotrophs.
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9. Consumers that eat producers to get energy:
Are first order (1st) or primary consumers
Are herbivores (plant-eaters)
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Most of the energy the primary consumer gets from the producer is used by the consumer, about 90%.
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11. Some of the energy moves into the atmosphere as heat.
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Real world connection
Brainstorm other real life events/ situations that lose energy as heat. Example a car running engines looses energy as heat.
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Some energy in the primary consumer is STORED & not lost to the atmosphere or used by the consumer itself. This energy, about 10%, is available for another consumer (predator).
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14. A consumer that eats another consumer for energy:
Is called a secondary consumer or 2nd order consumer
May be a carnivore or a omnivore
May be a predator
May be a scavenger
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Most of the energy the secondary consumer gets from the primary consumer is used by the secondary consumer.
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Some of the energy is lost as heat, but some energy is stored and can be passed on to another consumer.
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17. A consumer that eats a consumer that already ate a consumer:
Is called a 3rd order or tertiary consumer
May be a carnivore or a omnivore
May be a predator
May be a scavenger
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18. Consumers that eat producers & other consumers
are omnivores
Omnivores eat plants and animals
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Consumers that hunt & kill other consumers are called predators. The animals that are hunted & killed are called prey.
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20. Consumers that eat other dead consumers are called scavengers
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The transfer of energy from the sun to producer to primary consumer then to higher order consumers can be shown in a FOOD CHAIN.
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22. Food Chains Show Available Energy
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More Food Chains
The arrows show the direction of energy flow.
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Another way of showing the transfer of energy in an ecosystem is with an ENERGY PYRAMID
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Energy Pyramids Show
Amount of available energy decreases for higher consumers
Amount of available energy decreases down the food chain
It takes a large number of producers to support a small number of primary consumers
It takes a large number of primary consumers to support a small number of secondary consumers
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Food Webs:
Are interconnected food chains
They show the feeding relationships in an ecosystem
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28. How Many Chains are in this web? copyright cmassengale

29. Identify the Producers, Consumers, & Decomposers:
Count the Food Chains!
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In closing
Use one or more of the sentence stems to summarize you understanding of this activity.
What I now know that I did not know…..
What surprised me was…..
I wonder if….
I think the ______ was hard to understand because_________
I think the __________ concept was the easiest because________
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