Photosynthesis Flashcards
Pathway 1
High energy electrons pass from the chlorophyll to an electron acceptor
They then pass through a series of electron acceptors and back to the chlorophyll
They lose energy
The energy that is released is trapped by ADP and a phosphate to form ATP and H2O
Pathway 2
Two high energy electrons leave the reaction centre chlorophyll
They pass through a series of electron acceptors but do not return
The energy they release is used to make more ATP
These electrons combine with NADP+ to form NADP-
The chlorophyll gains new electrons from the splitting of water
Experiment
Place elodea in boiling tube with pond water Place in water bath and switch on lamp Measure distance from lamp Allow to adjust for 5 mins Count the number of bubbles produced Repeat at different distances
Part of the cell where photosynthesis takes place
Chloroplast
Sources of co2
Respiration
Burning of fossil fuels
Ways to increase rate of photosynthesis
Artificial light/temperature/co2 source
Role of co2
Electrons from chlorophyll and protons from proton pool combine with co2 to form glucose
Role of H20
Supplies protons
Light stage
Light that reaches the plant is trapped by chlorophyll. This is used by the plant to make glucose
Dark stage
Co2 enters the chloroplast. Hydrogen ions and electrons are released from NADPH and used to convert co2 to carbohydrate
In which stage is ATP formed
Light stage
Energised electron
Electron that has stored as much energy as possible
Role of NADP-
Hydrogen carrier for the dark stage
Role of ATP
Supplies energy for dark stage reactions
Role of chlorophyll
Traps light
