Name: Class: Honors Biology Period: Chapter 7 – Photosynthesis Exercise 1 – Photosynthetic Organisms (7.1) Autotrophs are able to produce their own organic molecules. All organisms that use light energy to make food are called photoautotrophs. Circle the organisms below that are photoautotrophs. Mushroom Seaweed Sponge Rosebush Alga Green bacterium Parasitic bacterium Squirrel Bread mold Pine tree Moss Grass Exercise 2 – The Process of Photosynthesis (7.2) Write the overall equation for photosynthesis in the boxes below. Show the substances used on the left, and those produced on the right. Use different colors for carbon, hydrogen, oxygen in carbon dioxide, and oxygen in water, and then use your color code to show were atoms of C, H, and O on the left end up in the products on the right. On the lines under the substances used, state which is oxidized and which is reduced. +  _______________ ______________ Exercise 3 – Overview of Photosynthesis (7.2) + + Label this diagram summarizing the two stages of photosynthesis. Include outer membrane of chloroplast, thylakoids, granum, stroma, light reactions, Calvin cycle, light, H2O, O2, electrons, NADPH, ATP, CO2, sugar, ADP + P, and NADP+. (Note: 5 and 7 are processes, 3, 9, 10, and 11 are places or structures, and the rest are inputs and outputs. Name: Class: Honors Biology Period: Exercise 4 – Overview of Photosynthesis (7.2) Refer to the equations and diagrams in the modules to match each of the phrases on the left with one of the ingredients or products or photosynthesis listed on the right. _____ 1.
_____ 2.
_____ 3.
_____ 4.
_____ 5.
Oxidized in the light reactions Reduced in the Calvin cycle A. Carbon dioxide, CO2 B. Water, H2O Carries H and electrons from the light reactions to the Calvin cycle Food produced by photosynthesis Source of H and electrons that end up in glucose C. Glucose, C6H12O6 D. Oxygen, O2 E. ADP + P _____ 6.
_____ 7.
_____ 8.
_____ 9.
_____ 10.
_____ 11.
Source of O atoms that end up in glucose Where O atoms from water end up Oxidized in the Calvin cycle F. ATP G. NADP+ H. NADPH Reduced in the light reactions Supplies energy to the Calvin cycle Where C and O atoms in carbon dioxide end up I.
Light _____ 12. Recycled from the Calvin cycle to make ATP _____ 13. Supplies energy to the light reactions _____ 14. Gas produced by reactions in the thylakoids _____ 15. Gas consumed by reactions in the stroma _____ 16. Source of carbon for carbon fixation _____ 17. Source of H for the Calvin cycle _____ 18. Picks up energized electrons from reactions in the thylakoids Exercise 5 – Electromagnetic spectrum (7.3) Order the following forms of electromagnetic energy from the shortest wavelength (1) to the longest (9). Which photons have the most energy? Which do plants use in photosynthesis? _____ a.
Green light _____ b.
_____ c.
_____ d.
Radio waves X-­‐rays Red light _____ e.
_____ f.
_____ g.
Ultraviolet light Infrared Microwaves _____ h.
_____ i.
Blue light Gamma rays Name: Class: Honors Biology Period: Exercise 6 – Electron Flow In Light Reactions (7.3) Label this diagram summarizing the pathway of electrons in light reactions. Label energy level, sun, electron acceptor, reaction center, pigment complex, Photosystem I, Photosystem II, e-­, 2H+, H2O, ½ O2, NADP+, H+, NADPH, CO2, CH2O, Calvin cycle reactions, and electron transport chain. Exercise 7 – The Calvin Cycle (7.4) Label this diagram summarizing the three parts of the Calvin cycle. Include the three steps of the process and the reactants, intermediate molecules, and products. Name: Class: Honors Biology Period: Exercise 8 – Other Types of Photosynthesis (7.5) Plants employ a variety of ways of fixing CO2 and saving water. State whether each of the following statements relates to C3 plants, C4 plants, or CAM plants. _____ a. May waste energy on photorespiration on a hot day _____ b. Trap carbon in four-­‐carbon compound, which donates it to Calvin cycle _____ c.
_____ d.
_____ e.
Corn and sugarcane Open stomata and trap CO2 at night Most plants _____ f.
_____ g.
Soybeans, oats, wheat, rice Can grow in hot, dry climates _____ h.
_____ i.
_____ j.
Also can grow in hot, dry climates Pineapple and many cacti Calvin cycle uses CO2 directly from air Exercise 9 – Climate Change (p. 127) Test your understanding of this module by stating whether you think each of the following would be likely to warm or cool the Earth through alteration of the greenhouse effect. _____ a.
Increased burning of coal to produce electricity _____ b.
_____ c.
_____ d.
Increased rate of growth of algae in the oceans Increased cloud cover, which would reflect more sunlight Hybrid cars that go farther on a tank of gasoline _____ e.
_____ f.
_____ g.
Increased cutting of tropical rain forests Using nuclear power instead of coal and oil to make electricity Reforesting deforested and overgrazed land _____ h.
_____ i.
_____ j.
Increased rate of decomposition of organic matter Slowing the population growth rate Using solar cells to generate electricity.