Photosynthesis 2 Flashcards
What is it
Plants making own food through light energy
Produces
Oxygen
responsible for forming
Fossil fuels
Removes what from air
Co2
Equation
6Co2 +6H2o -> C6 H 12 06 + 6o2
What does it require
Co2
Water
Light energy
Chlorophyll
Produces
Oxygen and glucose
Converts
Light energy to chemical energy
Saturation point
No more light can be absorbed and photosynthesis levels off
Water is absorbed from soil by roots by..
Osmosis
External source
Leaves getting c02 from stomata
Internal source
Leaves acquire co2 from own cellular respiration in cells
Artificial Co2
Burning gases in a green house
Sure if light stage
Chloroplast
Light stage
Light energy absorbed by chlorophyll molecule
Passes though pigments of molecules to reaction center in chlorophyll
Electrons become energized + leave the chlorophyll molecule
Energized electrons enter 2 pathways
Pathway 1
Energized electrons are passes along an electron acceptor
Loses energy along the way
This lost energy is combined with ADP + P = atp
Another name for pathway 1
Cyclic photophosphorylation
Pathway 2
2 energized electrons trapped by NADP+ form NADP-
Photolysis occurs
ATP made
Electrons lose some energy (doesn’t return)
These electrons join onto NADP+ and a proton to form NADPH
Photolysis
Light energy splits water into protons, electrons and oxygen
ATP
Provides energy for the convention of co2 into carbohydrates
NADPH
Supplies h+ ions and ejections which are used in the dark stage
Dark stage is controlled by
Enzymes
What is important about the plant in dark stage
It has optimum pH and temperature
Where does the dark stage occur
Chloroplast
NADPH is
Electrons and protons
