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Science Starter— Food Chains, Food Webs, and Energy Pyramids
Label the following as food chain, food web or energy pyramid copyright cmassengale
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Energy Flow Through an Ecosystem
Food Chains, Food Webs, Energy Pyramids copyright cmassengale
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Organisms that can store chemical energy in glucose during photosynthesis are called PRODUCERS. copyright cmassengale
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Plants are producers (autotrophs) which use most of the energy they make for themselves. copyright cmassengale
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Producers use cellular respiration to supply the energy they need to live. copyright cmassengale
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6 O2 + C6H12O6 --> 6 H2O + 6 CO2 + energy (ATP)
CELLULAR RESPIRATION is the chemical reaction that releases the energy from the glucose organic compound. copyright cmassengale
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The energy that is not used by producers can be passed on to organisms that cannot make their own energy. copyright cmassengale
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Organisms that cannot make their own energy are called CONSUMERS or heterotrophs. copyright cmassengale
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Consumers that eat producers to get energy:
Are first order (1st) or primary consumers Are herbivores (plant-eaters) copyright cmassengale
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Most of the energy the primary consumer gets from the producer is used by the consumer, about 90%. copyright cmassengale
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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. copyright cmassengale
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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). copyright cmassengale
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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 copyright cmassengale
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Most of the energy the secondary consumer gets from the primary consumer is used by the secondary consumer. copyright cmassengale
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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. copyright cmassengale
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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 copyright cmassengale
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Consumers that eat producers & other consumers
are omnivores Omnivores eat plants and animals copyright cmassengale
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Consumers that hunt & kill other consumers are called predators. The animals that are hunted & killed are called prey. copyright cmassengale
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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. copyright cmassengale
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Food Chains Show Available Energy
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More Food Chains The arrows show the direction of energy flow. copyright cmassengale
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Another way of showing the transfer of energy in an ecosystem is with an ENERGY PYRAMID copyright cmassengale
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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 copyright cmassengale
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Food Webs: Are interconnected food chains They show the feeding relationships in an ecosystem copyright cmassengale
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How Many Chains are in this web? copyright cmassengale
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Identify the Producers, Consumers, & Decomposers:
Count the Food Chains! copyright cmassengale
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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________ copyright cmassengale
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