Chapter 7: PHOTOSYNTHESIS
[Pages:22]Chapter 7: PHOTOSYNTHESIS
1. Overview of Photosynthesis 2. The "Light" Reactions 3. The "Dark" Reactions
1. Overview of Photosynthesis
What is Photosynthesis?
The process of converting light energy (kinetic) into energy stored in the covalent bonds of glucose molecules (potential).
6 CO2 + 6 H2O
Light energy
Carbon dioxide
Water PHOTOSYNTHESIS
C6H12O6 + 6 O2
Glucose
Oxygen gas
? carried out by photoautotrophs
? plants, phytoplankton, cyanobacteria (any photosynthetic organism)
? the basis of almost all ecosystems
? all "food energy" ultimately comes from the sun ? source of all atmospheric oxygen (O2)
Photosynthesis vs Respiration
essentially the reverse
of each other
Photosynthesis occurs in Chloroplasts
Leaf
Leaf Cross Section
Mesophyll Cell
CO2 O2
Chloroplast
Chloroplast
The Chloroplast
outer membrane inner membrane
stroma thylakoid
granum
Photosynthesis consists of 2 sets of Reactions
The light-dependent or "Light" Reactions:
Light
H2O
CO2
Chloroplast
NADP+
ADP +P
LIGHT REACTIONS (in thylakoids)
Electrons
ATP NADPH
CALVIN CYCLE (in stroma)
O
Sugar
? convert sunlight energy into chemical energy (stored in ATP & NADPH)
"Dark" Reactions (Calvin cycle):
? use chemical energy from light reactions to make glucose
2. Light-dependent ("Light") Reactions
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