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How many chloroplasts are there in plant cells?

A single-celled plant may have one large chloroplast, whereas the leaf cell of a multicelled plant may have as many as 20 to 100 chloroplasts. Chloroplasts are the plant organs in which photosynthesis takes place. Photosynthesis is the process by which green plants create food—specifically, they use the energy of the sunlight to convert water and carbon dioxide into carbohydrates and oxygen. Chloroplasts contain the green pigments chlorophyll a and b, which absorb the light energy used in photosynthesis.

Sources: Plants: Their Biology and Importance, pp. 17, 127; Villee, Claude A. Biology, 2nd ed., p. 107.

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1. Terms, Classifications, And Functions
   1. Who is known as the founder of botany?
   2. Who is Melvin Calvin?
   3. How many chloroplasts are there in plant cells?
   4. What is tropism?
   5. What are the parts of a flower?
   6. What is the best type of pollination?
   7. What is the first wildflower to bloom in the spring in the Northern United Stated?
   8. How are carnivorous plants categorized?
   9. Which flowers should be planted in the garden to attract hummingbirds?
   10. How does a bulb differ from a corm, a tuber, and a rhizome?
   11. What is wormwood?
2. Gardening And Agriculture
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   2. What are living stones?
   3. How are seedlings hardened off before planting?
   4. When is the best time to work the soil?
   5. Why should lawn clippings be left on the grass after mowing?
   6. How can squirrels be kept away from vegetable and flower gardens?
   7. Which flowers should be planted in the garden to attract butterflies?
   8. What is meant by "xeriscaping"?
   9. What does the term hydroponics mean?
   10. How are seedless grapes grown?
3. Trees
   1. What are the longest-lived tree species in the United States?
   2. How did the navel orange originate?
   3. Why do tree leaves turn color in the fall?
   4. Why are fall leaves bright red in some years and dull colors in other years?
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   6. What is the tallest tree ever measured?
   7. What is the secret of bonsai?
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   10. What are the distinguishing characteristics of pine, spruce, and fir trees?
   11. How much of a tree that is cut down is sold as timber?
   12. What conifers in North America lose their leaves in fall?
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