Chapter 11: Photosynthesis Flashcards
Where does Photosynthesis take place
Chloroplast
What absorbs light energy
Chlorophyll
What pathway is Oxygen produced
Pathway 2
Equation for Photosynthesis
6CO2 + 6H2O –> (chlorophyll &sunlight) –> C6H12O6 + 6O2
What is needed for Photosynthesis
Carbon dioxide ---- Atmosphere/Respiration Water ---- Soil Light ---- Sun/Artificial Chlorophyll ---- Chloroplast Temperature ---- 25 °c
What are the 2 Phases
Light Phase - Grana in Chloroplast
Dark Phase - Stroma in Chloroplast
How is Oxygen produced
Photolysis of water
The fate of the oxygen produced
Released into the atmosphere or used in respiration
The fate of the carbon dioxide in the dark stage
Combines with H+ and e- from NADPH to form C6H12O6
What is the dark stage controlled by
Enzymes
Energy source in dark stage
ATP
Dark Stage of Photosynthesis
◘ NADPH from light stage supplies H+ and e- and NADP+
◘ NADP transports electrons
◘ Carbon dioxide from air is reduced to form C6H12O6
◘ Energy source comes from ATP
◘ NADP and ADP are regenerated
Uses for products in dark stage
Respiration
Conversion to carbohydrates
NADP and ADP used again in light stage
Advantages of Genetically Modified Crops
Greater crop yield
Resistance to drought
Light Stage
Pathway 1 - Cyclic
◘ Light knocks en electron from chlorophyll pigments
◘ This becomes a high energy electron
◘ It passes through the electron transport chain
◘ Energy is released and it becomes a low energy electron
