9/1/2011

1

Autotrophs are the producers of the

biosphere

Photosynthesis occurs in chloroplasts

in plant cells

9/1/2011

2

The Chloroplast

Plants produce O2 gas by splitting

water

Photosynthesis is a redox process, as is

cellular respiration

9/1/2011

3

Overview: The two stages of photosynthesis are

linked by ATP and NADPH

Visible radiation drives the light

reactions

Interaction of light with a chloroplast

9/1/2011

4

Photosystems capture solar power

Two photosystems connected by an electron

transport chain generate ATP and NADPH

Chemiosmosis powers ATP synthesis in

the light reactions

9/1/2011

5

ATP and NADPH power sugar synthesis

in the Calvin cycle

Review: Photosynthesis uses light energy,

CO2, and H2O to make food molecules

Adaptations that save water in hot, dry

climates evolved in C4 and CAM plants