Photosynthesis

Photosynthesis - Photosynthesis Obtaining energy from light...

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1 Photosynthesis Obtaining energy from light The process of obtaining this energy The bigger picture of light and energy Definitions to get us started • Autotroph: an organism capable of living solely on its own using inorganic materials and some source of energy (e.g. sunlight) • Heterotroph: an organism that cannot make its’ own food, requires something that is already made Let’s boil this down • Photosynthesis can really be considered as occurring in two general steps: – First, converting light energy to chemical bonds in reduced molecules (electron carriers) and ATP – Second, reduced electron carriers and ATP are used to drive the synthesis of carbon dioxide that is taken in from the atmosphere
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2 OR… • We can also think of this from an ecological perspective • We can think of photosynthesis in terms of NPP, the amount of carbon dioxide taken in from the atmosphere and “fixed” into plant tissues (more on this later). – First let’s recall primary producers…what role
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Photosynthesis - Photosynthesis Obtaining energy from light...

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