8.1: Photosynthesis Converts Light Energy to the Chemical Energy of Food

8.1: Photosynthesis Converts Light Energy to the Chemical Energy of Food

Key Terms: Autotrophs, Heterotrophs, Mesophyll, Stomata, Stroma, Thylakoids, Chlorophyll, Light Reactions, Calvin Cycle, NADP⁺, NADPH, Photophosphorylation, Carbon Fixation

BELLWORK: Watch and take your own notes on the Photosynthesis and Cellular Respiration Bozeman video 

IN CLASS READING of Concept 8.1: Pages 161-165 in your text.

From page 161

1. Compare and Contrast Autotrophs with Heterotrophs.

From page 162
2. List and briefly describe the 2 stages of photosynthesis.
3. Explain how the structural organization of the cell allows for photosynthesis to be efficient.
4. Describe how photosynthetic bacteria are structurally similar to the chloroplast found in plant cells.
5. Summarize how the endosymbiont theory explains the evolution of the chloroplast.
6. State the layer of a leaf in which chloroplasts are mainly found.
7. Explain how CO₂ enters and O₂ exits the plant cell.
8. Draw a chloroplast and label the following: Stroma, Granum, Thylakoid, Thylakoid space, Inner membrane, Outer membrane, Innermembrane space
9. State where in the chloroplast you will find chlorophyll.

From page 163
10. Write the chemical equation for photosynthesis. Circle the reactants and put a rectangle around the products.
11. Explain the relationship between photosynthesis and cellular respiration.

From page 164
12. Explain where the O₂ given off a plant comes from.
13. Describe how oxygen-18 (¹⁸O) was used as a chemical tracer to provide evidence that the oxygen given off by a plant comes from water.
14. Compare the electron flow in photosynthesis to that in cellular respiration.
15. Decide whether photosynthesis is exergonic or endergonic.
16. State the energy source for photosynthesis.
17. Summarize the light reactions of photosynthesis.

From page 165
18. Summarize the Calvin cycle.
19. State where the Calvin cycle occurs in the chloroplast.
20. Draw a diagram that demonstrates how the light reactions and the Calvin cycle cooperate to make sugar.
21. Using a Venn diagram, categorize the following statements as pertaining to the light reactions, the Calvin cycle, or both: 1. Occurs in the stroma 2. Includes carbon fixation 3. Reduces NADP⁺ to NADPH  4. Occurs during daylight 5. The photo part of photosynthesis 6. The synthesis part of photosynthesis 7. Occurs in the thylakoid membranes 8. Requires ATP (makes ADP) 9. Makes ATP (requires ADP) 10. Input = water : output = oxygen 11. Input = CO₂ : output = [CH₂O] (sugar)