Photosynthesis Flashcards
Photosynthesis =
Building glucose using light
Chemical formula for photosynthesis
6CO2 + 6H2O → C6H12O6 + 6O2
Where does photosynthesis take place?
In the organelles called chloroplasts
What is the Stroma?
Aqueous substance surrounding thylakoids containing enzymes for the Dark Reaction/Calvin Cycle
What is the Thylakoids?
Structure containing chlorophyl pigments and enzymes for the light reaction
What kind of organisms do photosynthesis?
plants, algae and some bacteria
What is the overall purpose of photosynthesis?
To convert sunlight energy to chemical energy for it to feed plants
What structure is used to transport organic molecules from the leaf to other parts of the plant?
Vascular bundle
Why are leaves green?
Pigment in chloroplasts
Where does the light reaction occur?
Thylakoids
Where does the Calvin Cycle/Dark Reaction occur?
Stroma
How does a plant increase its biomass?
Through the formation of new organic molecules
What is the function of the photosystems?
Transform light energy to chemical energy. The absorption and transfer of light energy, which transfer electrons
At the end of the electron transport chain, where is the light energy that was absorbed and converted by chlorophyl stored?
NADP+ + H → NADPH
OR
Recycled
What two molecules bring chemical energy from the light reaction to the next stage of photosynthesis, the Calvin Cycle?
NADPH and ATP
Describe how oxygen gas is produced during photosynthesis.
Water is split in grana. Oxygen is released out of the plant through stomata
Describe how ATP is produced in the light reactions.
Protons inside the lumen diffuse out with the concentration gradient through ATP synthase. ATP synthase then uses the energy to combine ADP & P
List the three major events that happened before photosynthesis is complete
- Water splits and light is absorbed
- Transform light energy to chemical energy (ATP, NADPH)
- Uses chemical energy to make glucose
What two distinct processes is photosynthesis grouped into?
- Light Reaction
- Calvin Cycle/Dark Reaction
Does the light reaction require energy?
Yes
Does the light reactions require carbon dioxide and water?
Yes it requires water but does not require carbon dioxide
Where is the light energy transferred once the chlorophyl has absorbed it in the light reaction?
PSII and PSI
As the light energy is absorbed, water splits into H ions and O ions.
a) where does the O go?
b) where does the H ions go?
a) out of the port through the stomata
b) stays in the thylakoid lumen to build up gradient
The photosystems in the thylakoid membrane are connected by what?
ETC (electron transport chain)
