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Photosynthesis & the Environment
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Terms in this set (16)
irradiance
brightness
photorespiration
reaction in which rubisco attaches oxygen instead of carbon dioxide to ribulose bisphosphate
photosynthesis
process by which plants use the sun's energy to convert water and carbon dioxide into sugars
rubisco
the enzyme that catalyzes the first step of the Calvin cycle
Net CO2 uptate
CO2 from Photosynthesis - photorespiration - respiration
Net O2 release
O2 from Photosynthesis - photorespiration - respiration
Light response curve
Rate of photosynthesis:
Increases proportionally with increase in irradiance
Higher CO2 levels
increase in rate of photosynthesis
Higher levels of O2
inhibit photosynthesis
Oxygen
competes with CO2 for active site on rubsico
Photorespiration produces _____ instead of 2 PGA
PGA & phospholycolate
Amount of fixed carbon los to photorespiration
20%
As temperature increases rate of photosynthesis decreases because
stomata cloase to regulate water loss, causing decrease in CO2 concentration
Photosynthesis is more effiecienct in _____ temperatures
cooler
Shade plant leaves
thinner, broader, increased chlorophyll
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