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Energy Flow through an Ecosystem
Transcript of Energy Flow through an Ecosystem
7th Grade Life Science
Susan B. Anthony Middle School Turn and Talk:
What is energy?
How do organisms obtain energy?
Where does this energy come from? Photosynthesis: "photo" meaning light and "synthesis" meaning to make something.
Photosynthesis is a process used by plants and other organisms to convert the light energy captured from the sun into chemical energy that can be used to fuel the organism's activities. 6H2O + 6CO2 ---> C6H12O6 +6O2
-Sunlight is the catalyst that speeds up the reaction Autotrophs: Organisms that make their own food All oxygen in atmosphere is believed to originate from photosynthesis It is estimated that 99% of the energy used by living cells comes from the sun!!!!! Photosynthesis equation:
Know this and be able to Explain it
6CO2+ 6H2O----> C6H12O6 +6O2 "the first to eat" -organisms that only eat plants Heterotrophs: organisms that depend on others to make food. Organisms that do not make their own food. http://www.brainpop.com/science/energy/energypyramid/ -organisms that only eat meat -organisms that break down dead or decaying organisms Ticket to Leave:
Based on the 2nd law of thermodynamics, Why can their only be a maximum of 5 trophic levels? Laws of Thermodynamics First Law of Thermodynamics Energy can be changed from one form to another, but it cannot be created or destroyed. The total amount of energy and matter in the Universe remains constant, merely changing from one form to another Second Law of Thermodynamics The law says no reaction is 100% efficient. Some amount of energy in a reaction is always lost to heat. Also, a system can not convert all of its energy to working energy.