Chapter 10 Photosynthesis.

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Presentation transcript:

Chapter 10 Photosynthesis

Overview CO2 fixed to form organic molecules Organic molecules combined to produce glucose O2 released into the atmosphere

Significance Ultimate source of free oxygen Ultimate source of food for consumers Removes waste CO2 from the atmosphere

Organisms that photosynthesize Purple sulfur bacteria Cyanobacteria Eukaryotic single-celled algae Multicellular algae Plants

Chloroplasts Found in all eukaryotic photosynthetic organisms Thylakoid membrane Grana Stroma Double membrane

Main Pathways Light dependent Light independent Occurs within thylakoid membrane Produces ATP, NADPH, O2 Light independent Uses ATP, NADPH and CO2 Produces sugars

Light Dependent Pathway

Visible Light

Absorption Spectrum

Light Independent Pathway Calvin-Benson Pathway Stroma of chloroplast 3 CO2 molecules enter and combine with Ribulose bisphosphate Enzyme- Rubisco Glyceraldehyde 3 phosphate produced

Alternate Carbon Fixation Schemes C4 Plants CAM Plants Both conserve water by storing carbon during cooler times of the day

C 4 Pathway Distinctive leaf anatomy Phosphoenol pyruvate- 3 C Carboxylated- higher afinity for CO2 than Rubisco Concentrates CO2 within Mesophyll cells OAA- 4C Malate Donate CO2 to Calvin Cycle

CAM Crassulacean family of plants (succulents) Crassuslacean Acid Metabolism Stomata stay closed all day Accumulates CO2 at night for use during the day Similar to C4 but uses different organic acids

Compare C3 C4 and CAM

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