Concept 2: Analyzing the Processes of Photosynthesis
Refer to pg 83-92 in Holtzclaw, Ch 10 in Campbell and media resources
Refer to pg 297-299 in Holtzclaw, Lab Inv 5 in Lab Manual

The summary equation of photosynthesis including the source and fate of reactants and products

How the leaf and chloroplast anatomy relates to photosynthesis

How photosystems convert solar energy to chemical energy

How linear electron flow in the light reactions results in the formation of ATP, NADPH, and O2

How chemiosmosis generates ATP in the light reactions

How the Calvin cycle uses the energy molecules of the light reactions to produce G3P
CO2 + H2O → C6H12O6 + O2
1. Light Reactions “photo”
2. Calvin Cycle “synthesis”
The Light Reactions

Light energy excites electrons in ______________

Removal of _____________from H2O
o

Formation of ________
Electron Transport Chain
o
Reduction of NADP+ to ______________

Proton Motive Force

ATP Synthase to produce ______
The Electron Transport Chain
1.
4.
2.
5.
3.
6.
Chemiosmosis comparison
Cellular Respiration vs. Photosynthesis:
Unlike in cellular respiration, the proton motive force generated by the light reactions in photosynthesis happens in
three ways… Can you remember the three ways?
1. Electron transport chain powering the active transport of H+ into the _____________________
2. H+ produced in the ____________________from the splitting and oxidation of water
3. Removal of H+ from _____________during the reduction of NADP + to NADPH
The whole point of the light reaction was to transfer light energy to chemical energy in the form of:
Why?

electrons in NADPH

ATP
The Calvin Cycle

CO2 enters as a gas through the stomata (openings) of the leaves

Through the power of NADPH and ATP, CO2 gets converted into an __________________: a 3-carbon sugar
called glyceraldehyde-3-phosphate (G3P)

Can be converted to glucose, sucrose, starch, etc…
Phase 1 –
Phase 2 –
Phase 3 -
Practice
Try #12 – 15, 17-19, 21-22 p. 91-92
Go over Comparison Charts
Try animation activities (Campbell
Online)
Read about CAM plants and C4
plants for next day:
P. 88-89 Holtzclaw
P. 200-202 Campbell
Activity: Photosynthesis in Dry
Climates (Campbell Online)