In order to summarize Photosynthesis reactions, draw FOUR big boxes in a line down the middle of your page. Write 1) Photosystem II (water-splitting), 2) Photosystem I (NADPH-producing), 3) Chemiosmosis and 4) Carbon fixation (Calvin) Cycle inside these boxes. Below each process name write WHERE it occurs. Make arrows going in and out of each box. Write IN and OUT on top of the page above the arrows. Each box represent multi-step processes. You are focusing on the INPUTS and OUTPUTS. A. First focus on the flow of ENERGY. For each box write the INPUT and OUTPUT – the molecule(s) or form that - contain the energy. Indicate if it is kinetic or potential energy. B. Next, in a different color of ink (or highlighter) focus on the flow of ELECTRONS. For each box write the molecule(s) that carry the electrons IN and OUT. C. And finally, in a third color of ink (or highlighter) focus on the flow of CARBON. For each box write what molecule (if any) carries the carbon IN and OUT.

Match each term with its most suitable description. ____ PGAL formation a. absorbs light ____CO2 fixation b. converts light to chemical energy ____ autotroph c. self-feeder ____ ATP forms NADPH does not d. electrons cycle back to photosystem ____ photorespiration e. problem in C3 plants ____ photosynthesis f. Calvin-Benson cycle product ____ pigment g. water molecules split ____ photolysis in photosynthesis h. rubisco function

What is the overall purpose of the light reactions in photosynthesis?

Which part of the Calvin cycle would be affected if a cell could not produce the enzyme RuBIsCO?

What is the molecule that leaves the Calvin cycle to be converted into glucose? a. ADP b. G3P c. RuBP d. 3-PGA

The Overall Free Energy Change for Photosynthetic NADP+ Reduction What is the overall free energy change (G) for noncyclic photosynthetic electron transport? 4 (700-nm photons) + 4 (680-nm photons) + 2 H2O + 2 NADP+O2 + 2 NADPH + 2H+

Where in plant cells does the Calvin cycle take place? a. thylakoid membrane b. thylakoid space c. stroma d. granum

Figure 8.6 On a hot, dry day, plants close their stomata to conserve water. What impact will this have on photosynthesis?

Photosynthesis directly opposes respiration in determining how plants influence atmospheric CO2 concentrations. When a leaf is in the light, both photosynthesis and respiration are occurring simultaneously. The data in the Table were collected from the leaf of a sagebrush plant that was enclosed in a chamber that measures the rate of CO2 exchange. The same leaf was used to collect the data in Interpret the Data in Chapter 7. Respiration is shown as a negative and photosynthesis as a positive rate of CO2 exchange. The net photosynthesis rate is the amount of CO2 (in micromoles per square meter per second) assimilated by the leaf while respiration is occurring; a positive value indicates more photosynthesis is occurring than respiration. The light exposed to the leaf is quantified as the number of photons in the 400 to 700 nm wavelength, the photosynthetic photon flux density (PPFD); 2,000 mol/m2/s is equivalent to the amount of light occurring at midday in full Sun. Observation Photosynthetic Photon Flux Density (PPFD) (mol/m2/s) Net Photosynthesis (mol/m2/s) 1 2,000 9.1 2 1,500 8.4 3 1,250 8.2 4 1,000 7.4 5 750 6.3 6 500 4.8 7 250 2.2 8 0 -2.0 Why is net photosynthesis negative when PPFD is zero? Looking at the respiration data from Interpret the Data in Chapter 7, at what temperature do you think these data were collected? Source: Data based on unpublished research by Brent Ewers, University of Wyoming.

Describe the pathway of energy in light-dependent reactions.