PhotosynthesisPhotosynthesis

• The Light & Dark ReactionsThe Light & Dark Reactions

Carbon

Cycle

PhotosynthesisPhotosynthesis

• Complex process that actually occurs Complex process that actually occurs in 2 stages in 2 stages

Carbon

Cycle

Light Reactions of Light Reactions of Photosynthesis Photosynthesis

• Requires lightRequires light

• HH22O requiredO required

• Occurs in the granaOccurs in the grana

• Converts ADP Converts ADP molecules into ATPmolecules into ATP

Light Reactions of Light Reactions of PhotosynthesisPhotosynthesis

• Water (HWater (H22O) O) molecules are split molecules are split

• Result HResult H2 2 + O+ O 2 2

Light Reactions of Light Reactions of PhotosynthesisPhotosynthesis

• OO22 is released into is released into the atmospherethe atmosphere

• H will bond to H will bond to NADP to form NADP to form NADPHNADPH

Photosynthesis DiagramPhotosynthesis Diagram

4. O2

6. NADPH

5. ATP

2. H2O

LIGHT REACTION(GRANA)

1. LIGHT

3. Grana

Dark Reaction of Dark Reaction of Photosynthesis Photosynthesis • ATP & NADPH from ATP & NADPH from

light reaction are light reaction are used in the dark used in the dark reactionreaction

• Dark reactions do Dark reactions do not require lightnot require light

• Occurs in the Occurs in the stromastroma

• Requires carbon Requires carbon dioxidedioxide

Dark Reaction of Dark Reaction of PhotosynthesisPhotosynthesis• Calvin cycle Calvin cycle

(Carbon Cycle) (Carbon Cycle) synthesizes synthesizes glucoseglucose

Dark Reaction of Dark Reaction of PhotosynthesisPhotosynthesis• ATP from the light ATP from the light

reactions drives reactions drives the Calvin cyclethe Calvin cycle

• ATP ATP energy + energy + ADP + PADP + P

• NADPH releases H NADPH releases H NADP NADP

• H used to form H used to form glucoseglucose

Dark Reaction of Dark Reaction of PhotosynthesisPhotosynthesis• ADP & NADP ADP & NADP

returned to grana returned to grana for light reactionfor light reaction

Photosynthesis DiagramPhotosynthesis Diagram

4. O2 11. C6H12O6

8. NADP

6. NADPH

5. ATP

7. ADP10.

Carbon Cycle

2. H2O

9. CO2

LIGHT REACTION(GRANA)

DARK REACTION(STROMA)

1. LIGHT

3. Grana

Images- Clip ArtImages- Clip Art