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Energy Flow Through an Ecosystem. Food Chains, Food Webs, Energy Pyramids. Begins with the SUN Photosynthesis. 6CO 2 + 6H 2 O + sunlight & chlorophyll  C6H 12 O 6 + 6O 2. Photosynthesis

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Energy flow through an ecosystem

Energy Flow Through an Ecosystem

Food Chains, Food Webs, Energy Pyramids


6CO2 + 6H2O + sunlight & chlorophyll C6H12O6 + 6O2


  • Photosynthesis

  • Chemical reaction where green plants usewater & carbon dioxide to store the sun’s energy in glucose

  • ENERGY is stored in glucose

  • Glucose is stored as starch in plants





Cellular respiration is the chemical reaction that releases the energy in glucose

CELLULAR RESPIRATION is the chemical reaction that releases the energy in glucose.

6O2 + C6H12O6 -->  6H2O + 6CO2 + energy


The energy that is not used by producers can be passed on to organisms that cannot make their own energy.


Organisms that cannot make their own energy are called consumers or heterotrophs

Organisms that cannot make their own energy are called organisms that cannot make their own energy.CONSUMERS or Heterotrophs.


Consumers that eat producers to get energy
Consumers that eat producers to get energy: organisms that cannot make their own energy.

  • Are first order (1st) or primary consumers

  • Are herbivores (plant-eaters)


Most of the energy the primary consumer gets from the producer is used by the consumer

Most organisms that cannot make their own energy. of the energy the primary consumer gets from the producer is used by the consumer.


Some of the energy moves into the atmosphere as heat

Some organisms that cannot make their own energy. of the energy moves into the atmosphere as heat.


Some energy in the primary consumer is STORED organisms that cannot make their own energy.& not lost to the atmosphere or used by the consumer itself.This energy is available for another consumer (predator).


A consumer that eats another consumer for energy
A Consumer that Eats Another Consumer for Energy: organisms that cannot make their own energy.

  • Is called a secondary or 2nd order consumer

  • May be a carnivore or a omnivore

  • May be a predator

  • May be a scavenger


Most organisms that cannot make their own energy. of the energy the secondary consumer gets from the primary consumer is used by the secondary consumer.


Some of the energy is lost as heat but some energy is stored and can passed on to another consumer

Some organisms that cannot make their own energy.of the energy is lost as heat, but some energy is stored and can passed on to another consumer.


A consumer that eats a consumer that already ate a consumer
A consumer that eats a consumer that already ate a consumer: organisms that cannot make their own energy.

  • 3rd order or tertiary consumer

    • carnivore

    • omnivore

    • predator

    • scavenger

    • detritivore


Consumers that eat producers other consumers
Consumers that eat producers & other consumers organisms that cannot make their own energy.

  • Are called omnivores

  • Omnivores eat plants and animals


Consumers that hunt & kill other consumers are called organisms that cannot make their own energy.predators.The animals that are hunted & killed are called prey.


Consumers that eat other dead consumers are called scavengers
Consumers that eat other dead consumers are called organisms that cannot make their own energy.scavengers


  • Detritivores organisms that cannot make their own energy.

  • -Organisms that obtain their energy from organic wastes and dead bodies


The organisms that cannot make their own energy.transfer of energy from the sun to producer to primary consumer then to higher order consumers can be shown in a FOOD CHAIN.


Food chains show available energy
Food Chains Show Available Energy organisms that cannot make their own energy.


More food chains
More Food Chains organisms that cannot make their own energy.



Energy pyramids show
Energy Pyramids Show ecosystem is the

  • 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


Food webs
Food Webs ecosystem is the:

  • Are interconnected food chains

  • They show the feeding relationships in an ecosystem



Identify the producers consumers decomposers
Identify the Producers, Consumers, & Decomposers: ecosystem is the

Count the Food Chains!


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