Photosynthesis

Calvin Cycle (C3 Pathway)

6ATP + 6NADPH + 3 RuBP + 3 CO2 6 G3P

1 G3PReady for cell use

5 G3P3 ATP +

Calvin Cycle

6 NADPH

3 ATP

6 – G3P

3C5 – G3P

6 ATP5C

3 – RuBP(Ribulose

Bisphophate)

1C3 – CO2

3C6 - PGA

Calvin Cycle

1 – G3P5C

3 – RuBP

C3 Pathway

Rubisco

6 NADPH

3 ATP

6 – G3P

3C5 – G3P

6 ATP

5C3 – RuBP

1C3 – CO2

3C6 - PGA

Calvin Cycle

2 – G3P5C

3 – RuBP

C3 Pathway

Rubisco

3C1 – G3P

Photorespiration In arid conditions…

stomata close O2 builds up CO2 is depleted

Rubisco links RuBP to O2

No carbon fixation No sugars

ATP

O2

CalvinCycle

Vascular Tissue

C4 Pathway – PR Solution 1

CO2 fixing enzyme has minimal O2 affinity

4-C molecule forms(C4 Pathway)

Spatial separation of Calvin cycle (rubisco) and O2

CO2

3C

CO2

3C

Sugar

4C

MesophyllCell

BundleSheath

Cell

Rubisco works here

Temporal separation of carbon fixation & Calvin cycle Stomata open at night to collect CO2 (minimal evap.) Fixed CO2 kept until ATP & NADPH available during day

CAM Pathway – PR Solution 2

Photosynthesis ReviewLight Rxns C Fixation Calvin Cycle

C3 Plants

C4 Plants

CAM Plants

Mesophyll Mesophyll Mesophyll

Mesophyll MesophyllBundleSheath

Cell

Mesophyll Mesophyll Mesophyll

Photosynthesis Review

What is the disadvantage of open stomata?

Photosynthesis Review

What color of visible light carries the most energy?

Photosynthesis ReviewPut the following in the order

an e- may pass through:

Photosystem I, G3P, ETC, NADPH, photosystem II, water

Photosynthesis Review

Location in the cell of the Calvin Cycle

of C3 plants

Photosynthesis ReviewTWO things that can

happen to the primary product of ps?

Photosynthesis Review

Location of Calvin Cycle in C4

plants

Photosynthesis Review

Put the following in order of size:

RuBP, G3P, Starch, Glucose, Sucrose

Photosynthesis ReviewEnglemann’s experiment determined the effect of _______ on the rate of

photosynthesis.