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Mar_Ryan_block 2_mm5 photosynthesis (Process (light from the sun strikes…
Mar_Ryan_block 2_mm5
photosynthesis
energy flow
autotrophs, or organisms that can produce their own food,
capture energy to create food via chemical processes
many autotrophs are photoautotrophs, which capture sunlight
and use photosynthesis to produce food
heterotrophs must consume autotrophs or other heterotrophs as they cannot produce their own food
the sun is the primary source of energy for almost all ecosystems
the food that is either produced by autotrophs or eaten by heterotrophs are converted to energy via cellular respiration
cellular respiration breaks down food into the energy the organism needs for its life proccesses
importance
photosynthesis produces almost of the food and
energy for all ecosystems around the world
it allowed organisms to stray away from underwater
vents, and would lead to life above the surface of the oceans
it is responsible for the creation of the Earth's atmosphere, and the abundance of oxygen all around us
the calvin cycle
the calvin cycle then sends back ADP and NADP+ to the light reactions to create more ATP and NADPH
carbon is fixed and then reduced to produce glucose and other sugars
CO2 is taken in from the surrounding area
NADPH and ATP are sent from the light reactions to the calvin cycle
Process
light from the sun strikes a leaf :
the electrons from photosystem II are energized and sent to the Calvin cycle via photosystem I
H2O is broken into 2H+ and O, and the electrons from H2O are sent to photosystem I
the H+ are pumped out and the energy is used to create ATP via ATP synthase
the energy in photosystem II is transferred along the pigments, and then is used to break up H2O
the ATP and the NADPH, along with the energized electrons,are sent to the Calvin cycle to produce sugar
the light hits photosystem II and photosystem I