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Chapter 7 "Photosynthesis: Harvesting Light Energy"

Review the terminology and concepts presented in Chapter 7 Photosynthesis: Harvesting Light Energy

AB
epidermistissue formed of clear tightly packed cells which protect the surfaces of leaves
palisade mesophylltissue in the middle of the leaf is formed of tightly packed photosynthesizing cells that are taller than they are wide
guard cellsname of the cells that limit the loss of water by opening and closing the openings on the lower surface of the leaf
transpirationthe evaporation of water from a leaf
granafolded sacs of the chlorophyll holding inner membrane of the chloroplast
Priestleydiscovered that plants release oxygen
Engelmanndetermined the wavelengths of light used in photosynthesis
DeSausserediscovered that water is necessary for photosynthesis to occur
Dark Reactionspathway of photosynthesis stores chemical energy by synthesizing carbohydrates
photosystemgroup of pigments that absorb and channel the light energy of the sun
photosystem Iphotosystem that forms NADPH
photolysisreaction that splits water to release O2 and provide electrons and hydrogen ions for the light reactions
RuBP5 carbon sugar that participates in carbon fixation
absorption spectrumthe types of light absorbed by a particular pigment
Calvin Cyclepathway that regenerates RuBP
Hexose Shuntpathway that actually forms new molecule of glucose
green & yellowtwo colors of light are least important for photosynthesis
light, CO2 concentration, O2 concentration, temperaturefactors that alter or limit the rate at which photosynthesis occurs
chlorophyllgreen pigments found in plants
carotenesorange pigments found in plants
cyclic photophosphorylationuses the sunlight to form ATP that is used directly by plant cells
noncyclic photophosphorylationoccurs when carbon dioxide and water are readily available
cuticlewaxy barrier on the upper surface of the leaf
spongy mesophyllphotosynthesizing cells separated by many air spaces
stomateopenings on the lower side of the leaf that allow the exchange of gasses
thylakoidsinner membranes of a chloroplast
stromaspace in between the outer an inner membrane of a chloroplast?
Van Helmontdetermined that plants gain mass from water
Ingenhouszdetermined that plants need light to release oxygen
Mayerfirst to describe the Dark Reactions of photosynthesis
light reactionspathway of photosynthesis that converts sunlight into chemical energy
reaction centerpigment in a photosystem that accepts all of the energy absorbed by the other pigments
photosystem IIphotosystem that splits water and forms ATP
carbon fixationpathway that attaches carbon dioxide to RuBP
rubiscoenzyme catalyzes the initial reaction of the Dark Reactions of photosynthesis
PGAL3 carbon sugar is used in the Calvin Cycle to regenerate RuBP
photorespirationpathway produces PGA and glycolate when the concentration of O2 in a plant is too high
red & violetcolors of light are most important for photosynthesis
C4 plantsplants whose bundle sheath cells release carbon dioxide from a 4 carbon acid
CAM plantsdesert plants open their stomates at night and fix carbon dioxide into an acid
nonxanthophyllyellow pigments in plants


Science Instructor
Bronxville High School
Bronxville, NY

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