1. Write the word equation that describes the process of photosynthesis.9 8 10 20 30 7 5 2 3 4
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2. carbon dioxide + water + energy -->
glucose + oxygen + water + energy

3. In 1648, a Flemish alchemist, Jan van Helmont, had a theory
In 1648, a Flemish alchemist, Jan van Helmont, had a theory. To test it, he grew a tree in a tub of soil, adding nothing but measured quantities of water for five years. During that time he kept track of the weigh of the soil and the tree. At the end of the experiment the tree had gained 164 pounds and the soil had lost 2 ounces. What could von Helmont conclude from his experiment? 9 8 10 20 30 7 5 2 3 4
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4. Most of the tree’s increase came from something other than the soil

5. Why are chloroplasts green?

6. Chloroplasts are green because they contain a green pigment called chlorophyll.

7. What is the function of STOMATA?

8. They act as doorways for raw materials such as carbon dioxide, water vapor and waste gases to enter and exit the leaf. Stomata usually are open during the day when most plants need to take in raw materials to make food. They usually are closed at night when food making slows down. Stomata also close when a plant is losing too much water. This adaptation conserves water, because less water vapor escapes from the leaf.

9. Describe the function of GUARD CELLS.

10. Guard cells surround each stoma and control its size
Guard cells surround each stoma and control its size. As water moves into the guard cells, they swell and bend apart, opening a stoma. When guard cells lose water, they deflate, closing the stoma.

11. Explain why photosynthesis important to living things.

12. Photosynthesis produces food
Photosynthesis produces food. Organisms that carry on photosynthesis provide food directly or indirectly for nearly all the other organisms on Earth. Photosynthetic organisms, use carbon dioxide and release oxygen. This removes carbon dioxide from the atmosphere and adds oxygen to it. Most organisms, including humans, need oxygen to stay alive. As much as 90 percent of the oxygen entering the atmosphere today is a result of photosynthesis.

13. Draw a diagram illustrating photosynthesis.