Name 8 Class Photosynthesis Date Chapter Test A Multiple Choice Write the letter that best answers the question or completes the statement on the line provided. _____ 1. Which of the following is NOT a true statement about ATP? a. ATP consists of ribose, adenine, and three phosphate groups. b. ADP is produced when ATP releases energy. c. ATP provides energy for the mechanical functions of cells. d. Used ATP is discarded by the cell as waste. _____ 2. Look at Figure 8–1. All of the following are parts of an ADP molecule EXCEPT a. structure A. b. structure B. c. structure C. d. structure D. _____ 3. What happens during photosynthesis? a. Heterotrophs consume ATP. b. Heterotrophs produce ATP. c. Autotrophs consume carbohydrates. d. Autotrophs produce carbohydrates. Figure 8–1 _____ 4. Plants gather the sun’s energy using molecules called a. pigments. b. thylakoids. c. chloroplasts. d. glucose. _____ 5. Which structure in Figure 8–2 represents a single thylakoid? a. structure A b. structure B c. structure C d. structure D _____ 6. Where in the chloroplast is chlorophyll found? a. in the ATP b. in the stroma c. in the thylakoid membrane d. in the thylakoid space Figure 8–2 161 Name Class Date Figure 8–3 _____ 7. Which chemical shown in Figure 8–3 is an electron carrier molecule? a. H2O c. NADP+ b. carbon dioxide d. oxygen _____ 8. Why are electron carriers needed for transporting electrons from one part of the chloroplast to another? a. High-energy electrons would be destroyed. b. High-energy electrons are highly reactive. c. High-energy electrons are not soluble in cytoplasm. d. High-energy electrons get their energy from electron carriers. _____ 9. Photosynthesis uses sunlight to convert water and carbon dioxide into a. oxygen and carbon. b. high-energy sugars and proteins. c. ATP and oxygen. d. oxygen and high-energy sugars. Figure 8–4 _____ 10. In Figure 8–4, why might the candle in jar A burn longer than the candle in jar B? a. Carbon dioxide produced by the plant allows the candle to burn longer. b. Chlorophyll produced by the plant allows the candle to burn longer. c. Glucose produced by the plant allows the candle to burn longer. d. Oxygen produced by the plant allows the candle to burn longer. 162 _____ 11. Which of the following is NOT a step in the light-dependent reactions? a. High-energy electrons move through the electron transport chain. b. Pigments in photosystem II absorb light. c. ATP synthase allows H+ ions to pass through the thylakoid membrane. d. ATP and NADPH are used to produce high-energy sugars. _____ 12. Where are photosystems I and II found? a. in the stroma c. in the Calvin cycle b. in the thylakoid membrane d. in the cell membrane _____ 13. Which pathway represents the flow of electrons during photosynthesis? a. H2O → Photosystem I → Photosystem II b. O2 → ADP → Calvin cycle c. Photosystem I → Calvin cycle → NADP+ d. H2O → NADP+ → Calvin cycle _____ 14. The Calvin cycle takes place in the a. stroma. b. photosystems. c. thylakoid membranes. d. chlorophyll molecules. _____ 15. If you continue to increase the intensity of light that a plant receives, what happens? a. The rate of photosynthesis increases indefinitely with light intensity. b. The rate of photosynthesis decreases indefinitely with light intensity. c. The rate of photosynthesis increases and then levels off . d. The rate of photosynthesis does not change. Completion Complete each statement on the line provided. 16. Thylakoids are arranged in stacks known as 17. The area in Figure 8–5 labeled A is called the . . 18. A membrane protein called allows H+ ions to pass through the thylakoid membrane and into the stroma. 19. During the Calvin cycle, molecules of supply the carbon component of carbohydrates. 20. In many plants, the rate of photosynthesis when the weather becomes very cold. Short Answer In complete sentences, write the answers to the questions on the lines provided. Figure 8–6 21. Examine the food web in Figure 8–6 and identify whether each organism is an autotroph or a heterotroph. 22. Why are six carbon dioxide molecules required to make one glucose molecule? 25. Describe the relationship between the light-dependent and the light-independent reactions.