Photosynthesis Green plants use sunlight to make glucose
- Slides: 8
Photosynthesis Green plants use sunlight to make glucose in a process called 6 CO 2 + 6 H 2 O C 6 H 12 O 6 + 6 O 2 C 6 H 1206 + O 2 6 CO 2 + 6 H 2 O Fungi and other heterotrophic organisms use sugar to make ATP – the energy molecule necessary to sustain life.
6 CO 2 + 6 H 2 O C 6 H 12 O 6 + 6 O 2 carbon dioxide + water glucose + oxygen How is the glucose made by plants used by plants and animals as a source of energy? 6 CO 2 + 6 H 2 O C 6 H 12 O 6 + 6 O 2 carbon dioxide water glucose oxygen To release the energy contained in the bonds of glucose, the glucose must be converted to ATP. The process by which ATP is made from glucose is called cellular respiration.
Can photosynthesis occur without sunlight? Explain the following statement: • Sunlight is to a plant like gasoline is to a car. What happens when the sun goes down? Can cellular respiration occur in yeast without the presence of sugar?
Photosynthesis In water, carbon dioxide dissolves to form a weak acid. As a result, an acid-base indicator such as bromothymol blue can be used to indicate the presence of carbon dioxide. In this laboratory investigation, you will use bromthymol blue to observe the effects of photosynthesis. 1. Using the straw GENTLY blow one lung full of air into the test tube containing bromthymol blue. 2. Put approximately 3 cm sprig of elodea into the test tube. 3. Place the test tube in the test tube rack under the light. 4. Turn the light on. If necessary, adjust the lamp so that it is shining directly on the test tube.
Dried yeast requires heat and water to become “activated”. Yeast is a fungus that processes sugar through cellular respiration. In this laboratory experiment you will use warmed sugar water and a balloon to capture the gasses released by the yeast through cellular respiration. 1. Mix 4 table spoons sugar with 300 mls of water. 2. Place 20 mls warmed sugar water into a test tube. 3. Add ¼ teaspoon dried yeast. 4. Gently shake test tube to mix. 5. Cover with a balloon and wait.
6 H 2 O + 6 CO 2 C 6 H 1206 + O 2 Photosynthesis What will happen to the level of CO 2 in the water containing the elodea? C 6 H 1206 + O 2 6 CO 2 + 6 H 2 O What will happen to the balloon covering the top of the tube filled with sugar, H 2 O, & yeast?
In your BIN: 1. Below your hypothesis write background information (learned in this class discussion) that explains photosynthesis & cellular respiration. 2. Next, examine the test tubes. 3. Write down your observations. Has there been in change? Be descriptive. 4. Finally, write a conclusion which briefly explains what was done in this experiment, what the results are and why these results occurred. Finish your conclusion with what you might expect to happen in your test tube if it were left in the dark over night. Explain your prediction.
