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| 1. |
In most land plants, photosynthesis occurs in cells of the __________ of the leaves, because these cells contain the largest numbers of chloroplasts.
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| 2. |
Light energy is initially captured by "photosystems" within thylakoid membranes. Photosystems are organized arrays of __________.
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| 3. |
Why is carbon dioxide a key molecule in the light-independent reactions of photosynthesis?
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| 4. |
What is photorespiration?
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| 5. |
In the light-dependent reactions of photosynthesis, ATP is produced by chemiosmosis. Describe this process.
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| 6. |
A lovely tree called the flowering plum has beautiful pink flowers in spring and deep-purple leaves in summer. What types of pigments are plentiful in this plant? Can photosynthesis occur in these purple leaves? Explain your answer.
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| 7. |
Take a deep breath and slowly exhale. The oxygen in that breath is being used by your mitochondria in reactions that produce ATP from sugars and other food molecules you ate. Where did that oxygen come from originally?
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| 8. |
A scientist studying photosynthesis illuminated a culture of algae with bright visible light. She then turned out the light and simultaneously began to bubble radioactive CO2 gas into the culture. After 30 minutes, she stopped the reaction and measured the amount of radioactivity inside the cells. What did she find? Explain your answer.
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| 9. |
Imagine that you are trying to set up a large fish tank and want to select a colored light that will show off the fish to best advantage but will also allow the green plants in the tank to grow and stay healthy. You decide to measure the efficiency of photosynthesis by looking at the production of oxygen bubbles on the leaves (see Figure 7-5). At first, you use a white fluorescent lamp and see many oxygen bubbles on the leaves, indicating that photosynthesis is occurring normally. Next, you put a sheet of green cellophane between the white light and the water so that the light coming through to the tank appears green. Will the oxygen bubbles remain the same, increase, decrease, or disappear? Explain your answer.
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| 10. |
Which of the following is a true statement about photosynthesis?
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| 11. |
Leaves include a number of structural modifications for the purpose of photosynthesis, including __________.
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| 12. |
During photosynthesis, electrons are continuously lost from the reaction center of photosystem II. What source is used to replace these electrons?
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| 13. |
The term carbon fixation refers to __________.
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| 14. |
Photorespiration occurs when __________.
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| 15. |
How have C4 plants adapted to environmental conditions that would result in increased photorespiration?
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| 16. |
The stomata __________.
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| 17. |
You have just discovered a new plant with red-orange leaves. What wavelengths of visible light are NOT being absorbed by this pigment?
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| 18. |
In the light-dependent reactions of photosynthesis the difference in hydrogen ion concentration across the thylakoid membrane is used to generate __________.
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| 19. |
Which of the following represents the products of the light-dependent reactions of photosynthesis? For what process are these products needed?
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| 20. |
Which of the following is NOT required for the light-independent reactions of photosynthesis?
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| 21. |
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| 22. |
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| 23. |
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| 24. |
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| 25. |
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| 26. |
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| 27. |
Complete the following cycle of reactions.
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For each item below, use the pull-down menu to select the letter that labels the correct part of the image.
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| 28. |
Using the image below, provide the connections between photosynthesis and cellular respiration.
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For each item below, use the pull-down menu to select the letter that labels the correct part of the image.
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| 29. |
Label the structures in this cross section of a leaf.
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For each item below, use the pull-down menu to select the letter that labels the correct part of the image.
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| 30. |
Below is a diagram of light-dependent reactions of photosynthesis. Place the descriptions of the steps in this process next to the appropriate portion of the diagram.
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For each item below, use the pull-down menu to select the letter that labels the correct part of the image.
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| 31. |
Photosynthesis is measured in the leaf of a green plant exposed
to different wavelengths of light. Photosynthesis is
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| 32. |
Where do the light-dependent reactions of photosynthesis
occur?
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| 33. |
The oxygen produced during photosynthesis comes from
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| 34. |
The role of accessory pigments is to
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| 35. |
The generation of ATP by electron transport in photosynthesis
and cellular respiration depends on
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| 36. |
Where do the light-independent, carbon-fixing reactions
occur?
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Answer choices in this exercise are randomized and will appear in a different order each time the page is loaded.
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