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Star science tutorial 15 THE 7.5 c food web energy flow teak 7.5 c diagram the flow of energy through living systems including food chains food webs and energy pyramids sea star science tutorial 52 food webs and symbiosis for more information on food webs sea star signs tutorial to scientific models laws and theories for more information on the limitations of food web and food chain models energy flow in ecosystems almost all the energy that supports life on earth first came to earth as sunlight which is radiant or electromagnetic energy plants use the radiant energy and sunlight to rearrange the bonds and carbon dioxide and water to make sugar this process is called photosynthesis the full chemical equation for this reaction is six co2 + 6 h 2 o plus radiant energy produces c6h12o6 plus 60 to this chemical reaction changes radiant or electromagnetic energy into chemical energy the bonds between the carbon hydrogen and oxygen atoms in sugar store the chemical energy plants are collectively called the primary producers in food webs because they produce all the food that supports the rest of an ecosystems life-forms using the photosynthetic energy conversion process herbivores animals that eat only plants get all of their energy from plants in a food web they are called primary consumers all consumers use the chemical energy stored in plants by converting that energy into mechanical or thermal energy in a chemical reaction called cellular respiration the equation for cellular respiration is exactly the reverse of the photosynthesis reaction c6h12o6 + 602 produces six co2 + 6 h2o plus energy animals that eat these herbivores called primary consumers are carnivores or omnivores called the secondary consumers animals that eat the secondary consumers are called tertiary or third level consumers a food chain or food web is a diagram that shows the flow of energy from the plants primary producers to the herbivores the primary consumers to the omnivores and carnivores secondary and tertiary consumers the arrows in a food web show the direction of energy flow the food chain only shows one possible sequence of energy flow while a food web shows more of the alternative paths of energy flow no food web can show all the possible energy paths in the terrestrial food chain to the right the plant is the producer the grasshopper is the first level consumer the kangaroo rat is the second level consumer the snake is the third level consumer and the hawk is the fourth level consumer in the marine food chain the energy flows from phytoplankton to zooplankton to small fish to large fish to killer whale in this food chain the energy flows from the prickly pear cactus a producer to the wood rat a first level consumer to the weasel a second level consumer and finally to the Bobcat a third level consumer energy pyramids an energy pyramid is a diagram that shows the total amount of energy available at each level of a food web most of the energy available in an ecosystem is...
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