photosynthesis
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Photosynthesis. Introduction/Basic Info Furlow Novi High School. Photosynthesis. Essential for all life on earth. Autotrophs. Photosynthesis. CO 2. Glucose (only an example). Respiration. Consumers. Photosynthesis. So how do we actually see different colors?. - PowerPoint PPT PresentationTRANSCRIPT
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Introduction/Basic Info
FurlowNovi High School
Photosynthesis
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PhotosynthesisEssential for all life on earthAutotrophs
Consumers
Photosynthesis
Glucose (only an example)Respiration
CO2
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PhotosynthesisSo how do we actually see different
colors?The wavelength of the light will
determine the color of the light
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PhotosynthesisWhen light waves are absorbed from
this region of the visible spectrum it can be used by a plant
Green leaves look green because they have a pigment that does not absorb green light, it reflects it
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Photosynthesis
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PhotosynthesisThe main light absorbing pigment in green plants is
chrorophyll—found inside the chloroplasts
Like a mitochondrion, the structure of the chlorophyll is directly related its function (common theme in bio)
Have their on DNA in a ring, ribosomes (70S), an inner and outer membranes
Only actual green structures in a plant
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Photosynthesisstarch granuleRibosomes in
stroma
Stoma lamellae
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PhotosynthesisChlorphyll is a green pigment
Reflects green wavelengths of light, in the middle of the VS, absorbs non-green wavelengths
Blue and red regions are absorbed the most
Absorption spectra show which wavelengths are absorbed as a function of O2 production
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Photosynthesis
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PhotosynthesisTwo stages of photosynthesis: light
independent and light dependent
Different sets of reactions used in each stage
Light dependent produces ATP and allows photolysis to occur (O2 is a waste product)
Light independent allows for carbon fixation
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Photosynthesis—Light dependent
Chlorophyll, and other pigments, absorb light from the sun (or other source)
Energy from absorbed wavelengths produces ATP
Light also used to split water into H2 and O2 (photolysis)
Released O2 is source of aerobic respiration; ATP and H2 used by the plant
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Photosynthesis—Light dependent
light
water
H+
O2
electrons
H2
Chlorophyll and other
photosynthetic pigments
Light dependent
reactionsATP
• ATP production very similar to that of respiration w/ most energy being acquired via an electron transport chain
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ATP and H2 generated from light dependent stage used to covert CO2 and H2O into organic compounds (like glucose)
This carbon fixation…turning inorganic to organic
Fixation requires energy—all comes from sun
Photosynthesis—Light independent
6CO2 + 6H2O C6H12O6 + 6O2
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Photosynthesis6CO2 + 6H2O C6H12O6 + 6O2C6H12O6 + 6O2 6CO2 + 6H2O
RESPIRATION!!!!Plants do both…photosynthesis and
respirationRespiration occurs at a slow, steady rate,
regardless of light/dark = small yields of ATP. Why?
No muscle, large movement, or other energy requiring processes…less ATP needed vs animals
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Photosynthesis-rates
Photosynthesis does not occur at such a steady rate
Greatly affected by intensity of light, temperature, and CO2 levels
Can be measured directly via CO2 intake and O2 production amounts IF adjusted to account for respiration
Biomass (amount of plant/size) is an indirect method of measuring rate of photosynthesis—indirect b/c a lot of other potential factors
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Photosynthesis-rates
0
Day 1 Night 1 Day 2 Night 2
O2 released+ Photosynthesis
RespirationO2 taken in--
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Photosynthesis-rates
Light intensity—varies inversely with the square of the distance (farther away, less intense)
Rat
e of
ph
otos
ynth
esis
intensity
Enzymes at max rate
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Photosynthesis-rates
Temperature
Rat
e of
ph
otos
ynth
esis
Temp
Enzymes and other proteins begin to get denatured
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Photosynthesis-rates
CO2 concentration
Rat
e of
ph
otos
ynth
esis
CO2
Plateaus unless light intensity or temp. go up