Biology: Life on Earth

Chapter 7: Capturing Solar Energy: Photosynthesis

Essay Challenge

1. When light strikes an object, what determines how our eyes perceive the color of that object? [Hint]

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2. How do the light-dependent reactions of photosynthesis convert solar energy to chemical energy? [Hint]

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3. Describe the Calvin-Benson cycle. [Hint]

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4. How are the light-dependent and light-independent reactions of photosynthesis related to each other? [Hint]

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5. Suppose you have a mutant plant that lacks the enzyme that is necessary to regenerate RuBP. What will occur? [Hint]

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6. Will photosynthesis continue indefinitely in the light with no CO2? Why or why not? [Hint]

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7. If you were to examine the cells of an onion bulb you would find no chloroplasts. Will mitochondria be present? How do plant cells that do not contain chloroplasts survive? [Hint]

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8. You are performing an experiment in which you are collecting the products of photosynthesis. What reactant(s) would you need to begin with if you wanted to collect glucose that has radioactive carbon atoms? [Hint]

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9. You planted your seedlings in the early spring and went on vacation. Unfortunately, there was a hot, dry spell. Your neighbor forgot to water your new plants. Even though there was plenty of sun, the seedlings did not thrive. If you tested the seedlings for starch, what would you observe? [Hint]

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