Answer Key Photosynthesis

General Biology Photosynthesis Test 1. Which of the following is an autotroph? a) b) c) d) Mushroom Dog Monkey Tree 2. Which of the following is NOT an example of a heterotroph? a) b) c) d) Mushroom Leopard Grass Human 3. Energy is released from ATP when a) b) c) d) a phosphate group is added adenine bonds to ribose ATP is exposed to sunlight a phosphate group is removed 4. Which scientist showed that plants need light to grow? a) van Helmont and Calvin b) Priestley and Ingenhousz c) van Helmont and Priestley d) Preistley and Calvin 5. Which of the following are used in the overall reactions for photosynthesis? a) b) c) d) carbon dioxide water light all of the above 6. Most plants appear green because chlorophyll a) does not absorb green light b) reflects violet light c) absorbs green light d) none of the above 7. A granum is a (an) a) b) c) d) stack of chloroplasts stack of thylakoids membrane enclosing a thylakoid photosynthetic pigment molecule 8. The light collecting units of a chloroplast are the a) electron carriers b) photosystems c) stroma d) high-energy sugars 9. What are the products of the light-dependent reactions? a) b) c) d) oxygen gas ATP NADPH all of the above 10. Which step is the beginning of photosynthesis? a) b) c) d) Pigments in photosystem I absorb light Pigments in photosystem II absorb light High-energy electrons move through the electron transport ATP synthase allows H+ ions to pass through the thylakoid membrane 11. The Calvin cycle takes place in the a) b) c) d) stroma photosystems thylakoid membranes chlorophyll molecules 12. If carbon dioxide is removed from a plant's environment, what would you expect to happen to its production of high-energy sugars? a) b) c) d) More sugars will be produced No sugars will be produced The same number of sugars will be produced but without carbon dioxide Carbon dioxide does not affect the production of high-energy sugars 13. Plants take in the sun's energy by absorbing a) b) c) d) high-energy sugars chlorophyll a chlorophyll b sunlight 14. Where are photosystems I and II found? a) b) c) d) in the stroma in the thylakoid membrane in the Calvin cycle all of the above 15. If you continue to increase the intensity of light that a plant receives, what happens?* a) b) c) d) 16. The rate of photosynthesis increases with light intensity The rate of photosynthesis decreases with light intensity The rate of photosynthesis increases and then levels off The rate of photosynthesis does not change Photosynthesis requires light, water, carbon dioxide, and ___________________ If you separate pigments found in a typical plant cell's chloroplasts, you will find, _________________, orange, and red pigments. 17. 18. Thylakoids are a(an) _________________ color because they contain chlorophyll. 19. In plants, the rate of photosynthesis _________________ when the weather becomes very cold. The light-dependent reactions convert NADP+ and ADP into energy carriers NADPH and ________________. 20. 21. How do heterotrophs obtain energy? 22. What is ATP, and when is energy released from it? 23. Write the overall equation for photosynthesis in both symbols and words. 24. List two factors that affect the rate of photosynthesis. What is the difference between an autotroph and a heterotroph? Give an example of each type of organism. 25. 26. What processes take place within the thylakoid? 27. What does the Calvin cycle do? 28. What are the products of the light-dependent reactions? 29. Identify three factors that affect the rate of photosynthesis, and explain the effect of each? 30. What chemical from the atmosphere is used in the Calvin cycle to produce sugars?