SAM Teachers Guide Photosynthesis
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1 SAM Teachers Guide Photosynthesis Overview This activity focuses on how certain molecules called pigments interact with light and determine the color of plants. Students explore how molecules such as chlorophyll interact with light and gain energy. Students are then introduced to the concept that this energy is used by plants to make sugar and release oxygen which is the beginning of the photosynthesis process. Learning Objectives Students will be able to: Interpret a model of photons emitted by sunlight. Describe how different colored leaves absorb, reflect, and transmit different photons due to the presence or absence of a variety of pigments. Correlate the energy of a photon to the change in energy levels of electrons in molecules. Observe the structure of a chlorophyll molecule and explain how it can transfer energy to other molecules. Possible Student Pre/Misconceptions Plants are green because they absorb only green light. Photosynthesis can take place at night. Plants get their food from soil, not through sunlight. Models to Highlight After completion of the activity: Models to Highlight: Page 2 What Happens When Light Shines on Leaves o Review with students how the red leaf absorbs photons of any color but red while the green leaf absorbs photons of any color but green. This observation is the foundation for understanding the rest of the activity. Page 3 3D Structure of Chlorophyll Molecule o Point to the two parts of the molecule: the light catching head and the hydrocarbon tail. Talk about the structure and the function of these different parts of the molecule. o Link to other SAM activities: Intermolecular Attractions and Solubility. Help students relate the structure of the molecules to how they function.
2 Page 5 How Does Chlorophyll Work? o Students will most likely need to consult the Help link in order to clarify how to complete this task. It is worthwhile to discuss what the students are doing and why they are doing it. Compare this process to what is really going on in the photosystems of leaves. o Link to other SAM activities: Excited States and Photons and Spectroscopy. Explain the correlation between the energy of the photons and the excited states of the electrons. Possible Discussion Questions: How would leaves look different if chlorophyll was not the primary pigment present in chloroplasts? How does the process of photosynthesis connect to the idea of energy being converted from one form to another?
3 Connections to Other SAM Activities Photosynthesis is a biology capstone activity that deals with light being captured and the light matter interaction. It has many supporting activities. Atomic Structure introduces students to atoms, orbitals, and excited states. Excited States and Photons and Spectroscopy help students grasp the concept that certain atoms and/or molecules can only absorb certain photons or wavelengths of light. Lipids and Carbohydrates and Nucleic Acids and Proteins look at the structure and function of biomolecules and help students explore the chlorophyll molecule. Cellular Respiration describes a different part of the photosynthesis process the electron transport chain.
4 Activity Answer Guide Page 1: 1. What color light has the highest frequency? (d) 2. Which photon has the lowest amount of energy? (a) Page 2: 1. Based on the model, which of the following must be true? (Check all that are true.) (c) (d) 2. What will happen if we put a plant in a dark room and only shine green light on it? Explain your answer. A green leaf will absorb photons of any color but green. Since the light is green, the leaf will reflect the green light and not absorb any photons. The plant will die. Page 3: 1. Based on your observation of the above model, which molecule is responsible for absorbing light in the leaf? (c) 2. Click the Whole Leaf button and describe three things you have observed about photons after they hit a leaf. Sample responses: 1. The green photons are bounced back. 2. The other color photons are absorbed. 3. Non-visible light photons are absorbed. 4. Some photons pass through the leaves. (This is why leaves are semi-transparent.) 3. In the cell, chlorophyll binds to other molecules in a large complex. Based on the structure of chlorophyll's tail, with which of the following would chlorophyll associate? (Check all that apply.) (a) (b) 4. Heme is a functional group similar to chlorophyll's head, but it has iron in place of magnesium. Heme is what makes blood look red. What colors of light does iron help heme absorb? Explain your answer. (Hint) Heme must absorb all colors of light except red. That is why blood looks red as red photons are reflected back. Chlorophyll absorbs colors other than green. Leaves look green because green photons are reflected back. Page 4: 1. How do additional pigments help chlorophyll to transfer energy for photosynthesis? (c) 2. Compared to the other pigments, there is so much chlorophyll in leaves that they appear green. In the autumn, pigments start to break down. How can you explain the other colors in autumn leaves? With a lack of sunlight in the fall (as compared to summer) comes a lack of chlorophyll. Without the presence of chlorophyll the other colored pigments can be seen in autumn leaves. The principle of light being reflected back is the same. Page 5: 1. Describe what you need to do in order to produce a blue pigment. You need to prevent blue photons from being absorbed. The energy levels that represent blue photons being absorbed must be deleted to create a gap in energy levels. 2. Place the snapshot of the energy level diagram you have designed that produces a blue pigment. Sample snapshot:
5 plant to make its own food? Explain your answer. Indian pipe plants must not make their own food, but rather, they must get food in some other way such as parasitism. Without chlorophyll, they cannot excite the electrons to go through the process of photosynthesis. This makes the Indian pipe plant more similar to an animal or fungus. Page 6: Summary 1. What color of light is LEAST effective in causing photosynthesis? Why? Green, because it is reflected back. 2. If a substance is blue, then what is true about the photons it absorbs? (b) 3. Water tends to absorb more red photons than blue ones. Red algae are the known photosynthetic organisms that live deepest in the sea (as deep as 600 feet). Why do they have a red color when we observe them under sunlight? Because they are reflecting the red light when they are put in the sunlight. 4. Which of the following must be true about photon absorption and energy levels of pigments? (a) 5. Indian pipe plants (see the image on the left) contain no chlorophyll. What can you conclude about the ability of the Indian pipe
6 SAM HOMEWORK QUESTIONS Photosynthesis Directions: After completing the unit, answer the following questions to review. 1. A lichen is a symbiotic association of a fungus and green algae. Lichens are considered to be producers and primitive plants. Given what you have learned in this lesson, what role do you think the green algae play? 2. The snapshot shows the energy levels of a blue pigment. Explain how the gap in energy levels accounts for the pigment absorbing any photons but blue ones. 3. Describe what a photosystem is. 4. What determines the frequencies of the photons a pigment molecule absorbs? 5. Career connection: More solar energy hits the surface of the Earth in one hour than is used by the entire planet in one year. Plants absorb 3-6% of the sun hitting them through photosynthesis. Computer models are an important tool for planning for and designing new ways to capture solar energy to be used for electricity. Research and summarize one way people are trying to convert light/solar energy into some other form of energy.
7 SAM HOMEWORK QUESTIONS Harvesting Light for Photosynthesis With Suggested Answers for Teachers Directions: After completing the unit, answer the following questions to review. 1. A lichen is a symbiotic association of a fungus and green algae. Lichens are considered to be producers and primitive plants. Given what you have learned in this lesson, what role do you think the green algae play? The green algae can go through photosynthesis to make food for the symbiotic association. The fact that the algae are green is a clue that they contain chlorophyll, the pigment necessary to start the photosynthetic reactions. 2. The snapshot shows the energy levels of a blue pigment. Explain how the gap in energy levels accounts for the pigment absorbing any photons but blue ones. The gap shown makes it impossible for blue photons to be absorbed. If a photon's energy is not equal to the energy difference between any two energy levels in the molecule, then the photon cannot be absorbed. Instead, it will bounce back or pass through. Since blue photons have frequencies in the range where there is a gap of energy levels, so they are reflected back and seen as a blue pigment. 3. Describe what a photosystem is. A photosystem is a group of chlorophyll molecules held together by proteins. 4. What determines the frequencies of the photons a pigment molecule absorbs? When a pigment molecule absorbs a photon, one of the molecule s electrons gains energy and the electron jumps from a lower energy state to an excited state. The difference between the lower energy and the higher one is equal to the energy of the absorbed photon. 5. Career connection: One technique for capturing solar energy is to use dyes inspired by chlorophyll in a type of organic solar cell. Others include silicon-based solar cells, heating water using mirrors, and biomass for fuel, where the solar energy captured by plants is converted to heat energy through burning of the plant.
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