Photosynthesis chap 2.9
RXN
Least useful ligth- Green light
reflected
PHOTOSYNTHESIS- overview
Thylakoid- contains chlorophyll
Light energy- trapped by chlorophyll
photosynthetic chemical
PHOTOLYSIS-Water- affected by an enzyme which splits water
hydrogen
When light energy hits chlorophyll- triggers release of electrons
Further split- H+ and an electron
Oxygen
Waste
Electrons as passed through the elctron chain- supplied by water, when split
build up of H+ (protons) in the thylo- High conc
NADP combines with a proton, and accepts an electron
forms NADPH
The H+ protons move out through a protein and help ADP combine w P to form ATP
CALVIN CYCLE CARBON FIXING
CO2 to C6H12O6
in the presence of NADPH (hydrogen dono)
And CO2
LIGHT INDEPENDANT
LIGHT DEP- Intermembranial space of thylo
LIGHT INDEP- strom
Ligth dep rxn
- 2 Photosystems- PS2 main PS1- backup
- Ligth excites chlorplasts
- 2electrons move down the chain
NADP+ + H+ + electron= NADPH
- Photolysis-To replace electrons- water splitting enz splits water into oxy and hydro- HYDRO- PROTON and ELECTRON
high proton gradient
click to edit
Chromatography- pigments in the chromatogram of spinach are identified.
Checking Rf Value
checking distance travelled by solvent
colour analysis- spectrophotometer
Rf= Dist moved by pig/dist moved by solvent
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a. autotrophs perform photosynthesis
b. carbon dioxide and water are the reactants/raw materials required for «photosynthesis»
c. light splits water molecules/causes photolysis
d. «photolysis» releases oxygen as a «waste» product
e. light energy is converted into chemical energy
f. «photosynthesis» produces organic compounds/glucose/carbohydrates
g. photosynthesis occurs in chloroplasts
h. chlorophyll «photosynthetic pigment» absorbs light
i. different pigments absorb different wavelengths «of light»
j. chlorophyll absorbs red and blue light/ends of the spectrum
k. carbon dioxide concentration/temperature/light intensity are limiting factors
PHOTOLYSIS
water is split/breaks
b. using energy from light
c. electrons «from photolysis» pass to photosystem II
d. oxygen is a «waste» product
e. hydrogen ions/protons are produced