(a) Leaf surfaces contain stomata. (b) Carbon dioxide diffuses into leaves through stomata. Leaf...
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Transcript of (a) Leaf surfaces contain stomata. (b) Carbon dioxide diffuses into leaves through stomata. Leaf...
(a) Leaf surfaces contain stomata.
(b) Carbon dioxide diffuses into leavesthrough stomata.
Leaf surface
20 m
Guard cells Pore Stoma
Interior of leaf
StomaCO2Extracellularspace
Photosyntheticcells
Leafsurface
O2
H2O
Wavelengths (nm)
Shorterwavelength
Longerwavelength
Visible light
Higherenergy
Lowerenergy
Gammarays X-rays
Ultra-violet Infrared
Micro-waves
Radiowaves
In plants, cells that photosynthesizetypically have 40–50 chloroplasts
Outer membraneInner membrane
Chloroplast
10 m
0.5 m
Thylakoids (flattened sacs)
Granum (stack of thylakoids)
Stroma (liquid matrix)
FLUORESCENCE or
Energy in electron is transferred to nearby pigment.
Photon
Chlorophyll -carotene
Chlorophyll and -carotene molecules in antenna complexChlorophyll molecule
Photon
Lower
Higher
En
erg
y o
f e
lec
tro
n
Electron drops back downto lower energy level; heatand fluorescence areemitted.
Electron is transferred toa new compound.
REDUCTION/OXIDATIONorRESONANCE
Reaction center
Fluorescence
Heat
Figure 10-14
Higher
Slide 6
Lower
En
erg
y o
f el
ectr
on
4 Photons
Photosystem II
produced viaproton-motive force
4 Photons
Photosystem I
Electron transport chain
Electron transport chain
Higher
Photon
En
erg
y o
f el
ectr
on
Lower Photosystem I
produced viaproton-motive
force
P700
Chloroplast
Stroma(liquidmatrix)
Granum(stack of thylakoids)
Thylakoid membranes
Cytochromecomplex
Photosystem II Photosystem I ATP synthase
Most abundant in the thylakoidmembranes exterior to granum
Most abundant in the thylakoidmembranes of granum