ࡱ> l hbjbjղղ d?( PPPPP4hD\$^"V> r\t\t\t\t\t\t\$_an\P44"\PP\"""PPr\"r\"""OS 6P*^\\0\Q7bx7bTSS7bPS"\\D!l\7b : Food and energy for all: Teacher guide Michigan state science standards content expectations (Michigan Department of Education 2009) L.OL.07.61: Recognize the need for light to provide energy for the production of carbohydrates, proteins, and fats. L.OL.07.62: Explain that carbon dioxide and water are used to produce carbohydrates, proteins, and fats. S.IP.07.11: Generate scientific questions based on observations, investigations, and research. S.IP.07.13: Use tools and equipment (stopwatches, meter sticks, balance, graduated cylinders, beakers). S.IP.07.14: Use metric measurement devices in an investigation. S.IP.07.15: Construct charts and graphs from data and observations. S.IP.07.16: Identify patterns in data. S.IA.07.11: Analyze information from data tables and graphs to answer scientific questions. S.IA.07.12: Evaluate data, claims, and personal knowledge through collaborative science discourse. S.IA.07.14: Draw conclusions from sets of data from multiple trials of a scientific experiment. S.IA.07.15: Use multiple sources of information to evaluate strengths and weaknesses of claims, arguments, or data. S.RS.07.1: Evaluate the strengths and weaknesses of claims, arguments, and data. S.RS.07.13: Identify the need for evidence in making scientific decisions. S.RS.07.14: Evaluate scientific explanations based on current evidence and scientific principles. S.RS.07.15: Demonstrate scientific concepts through various illustrations, performances, models, exhibits, and activities. Next Generation Science Standards (NGSS Lead States, 2013) LS1.C: Organization of Matter and Energy Flow in Organisms Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use. PS3.D: Energy in a Chemical Processes and Everyday Life The chemical reaction by which plants produce complex food molecules (sugars) requires an energy input (sunlight) to occur. In this reaction, carbon dioxide and water combine to form carbon-based organic molecules and release oxygen. MS-LS1: From Molecules to Organisms: Structures and Processes Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms. Science and Engineering Practice: Constructing Explanations and Designing Solutions Construct a scientific explanation based on valid and reliable evidence obtained from sources (including students own experiments) and the assumptions that theories and laws that describe the natural world operate today as they did in the past and will continue to do so in the future. TYPE OF INQUIRY Guided and open TIME Guided lesson day 1: 50 min. Open investigation Day 2: 50 min. Writing focus question, identifying variables, separating into groups, adjusting procedure, and creating data tables Day 3: 50 min. Conducting investigation, analyzing results, and writing explanation Day 4: 50 min. Discussing student findings and discussion questions Day 5: 50 min. Extension activity EDUCATIONAL OBJECTIVES The student will be able to identify what materials a plant needs for photosynthesis. The student will be able to relate photosynthesis to the flow of matter in a food chain. CONCEPTS ADDRESSED Requirements for photosynthesis Flow of matter and energy into and out of organisms. What it exactly means to be a producer Energy transformation within photosynthesis COMMON STUDENT DIFFICULTIES I have found that students have a hard time understanding that light must be present for photosynthesis to occur. The groups in the open investigation that study light will find that without light, their spinach leaves will not go through photosynthesis. Students believe that carbon dioxide, water, light, or soil is food for plants (Kestler 2014). This can result from students misunderstanding what food actually is or relating plants to animals in thinking of food as something an organism takes in, not something it makes. During the post discussion for this activity, students generate their own definition of food. If not included in their initial explanations, students will be asked to think about what organisms use food for. In realizing that food is something that organisms break down to provide energy to live and grow, students will more easily understand that it is the sugar that plants make that serves as food for plants. Asking students whether we get food from the water and carbon dioxide in plants when we eat them can help with this idea as well. PREREQUISITE KNOWLEDGE Rate is how long it takes a process to complete. Basic understanding of different types of energy and transformations Understanding of the law of conservation of energy Basic understanding of a chemical reaction: how to write one, what the products and reactants are, where the atoms of the products come from Understanding of the law of conservation of matter: matter is not created or destroyed in a chemical reaction, as atoms that make up the reactants just rearrange to make up new substances (products) Basic understanding of what food webs show TEACHER BACKGROUND Photosynthesis is a process through which organisms, such as plants, algae, and phytoplankton, make their own food. These organisms take in water and carbon dioxide, the bonds of which are broken by light energy to make sugar (glucose) and oxygen. The chemical reaction that occurs during photosynthesis is 6 H2O + 6 CO2 + Light energy ( C6H12O6 + 6 O2. The law of conservation of matter states that matter is not created or destroyed. Thus, all atoms present in the water and carbon dioxide (reactants) are present in the products, sugar and oxygen. Through this process, light energy is transformed into chemical energy as it drives the formation of glucose (C6H12O6) and oxygen (O2) from carbon dioxide and water. The chemical energy will later be used for growth, repair, and reproduction within the plant as the sugar is broken down into CO2 and H2O during respiration. In plants, food is not water, carbon dioxide, light, or soil. This is a common misconception (Kestler 2014). Sugar is the food source for plants. Plants can also rearrange sugar molecules and attach other atoms to sugar to form other carbohydrates, lipids, and proteins, which can be stored and used later. We know that this occurs because when we eat potatoes, corn, wheat bread, maple syrup, and beet sugar, we are consuming materials from plants that give us carbohydrates (sugar and starches). We also get proteins from beans and fats from olives, sunflower seeds, and corn. Photosynthesis plays an important role not only for producers, but also for decomposers and consumers. Photosynthesis is what starts the cycling of matter and energy within a food web. Without producers using photosynthesis, there would be no production of food that consumers and decomposers could take in to use as energy for life processes. This connection will be made in the extension activity, during which students analyze what happens when different aspects of a food web are removed. SAFETY Students should wear safety glass. Bulbs will get very hot; do not touch them. Hydrogen peroxide, baking soda, and soap should not be ingested and can irritate the eyes. MATERIALS, PREPARATION, AND DISPOSAL sodium bicarbonate (baking soda) liquid soap plastic syringe (10 cc or larger) leaves (i.e., spinach) plastic cups timer 500 mL graduated cylinder light source hole punch 500 mL beakers 1 mL or 5 mL plastic disposable pipette metric ruler different-colored bulbs (red and green) Any type of lamp can be used for this lab. I use a light with a clamp-on ring stand for easy adjustment of height. On the day before the lab, make sure you have one clear plastic cup (size does not matter) and one beaker for each student. Also, buy plenty of green spinach leaves for the lab. Each group will need about three leaves. Have one syringe and light source available for every group. Biology behind the procedures: Leaf disks normally float. When the air spaces are infiltrated with solution, the overall density of the leaf disk increases, and the disk sinks. The infiltration solution includes a small amount of sodium bicarbonate. Bicarbonate ions serve as the carbon source for photosynthesis, as the partial pressure of CO2 in water is too low for photosynthesis. As photosynthesis proceeds, oxygen is released into the interior of the leaf, replacing some of the liquid with a gas, which makes the disks less dense, causing the disks to rise. Because cellular respiration is taking place at the same time, consuming oxygen, the rate at which the disks rise is a relative measurement of the net rate of photosynthesis. Part A lab setup (to be done before class): Set up ring stands and attach a lamp to each using a clamp. Make sure you have enough so that students are not in groups larger than four. At each station, set a plastic cup, syringe, stopwatch, hole punch, plastic pipette, meter stick, and 500 mL beaker. At a central station near a sink, place a few 500 mL graduated cylinders, a scale, baking soda, liquid soap, and spinach leaves. More detailed description of proceure and potential student difficulties: The purpose of adding one drop of liquid soap is to wet the hydrophobic surface of the leaf to allow solution to be drawn in. When you punch holes in the leaves, make sure you avoid major veins. Pull the end of the plunger out to place disks in the syringe. Before you put your finger over the end and draw back on the plunger, make sure you press the plunger up so there is no gas above the solution inside the syringe. Then put your thumb over the nose of the syringe and pull back on the plunger to create a vacuum to draw solution into the leaf disks. When the vacumm is complete, after 10 seconds, all disks should sink. If not, reapply the vacuum as many times as needed. Once all disks sink, have students do three more 10-second vacuums. This removes bias in the ability of students to create a good vacuum. Remove the plunger, pour the disks into cup, and place them under light. For 15 minutes, record how many disks are floating at one-minute intervals. Part B lab setup: Students can investigate the effect of different factors: Carbon dioxide: Change amount of baking soda in the solution. Water: Place leaves under light (1015 min.) and allow them to dry out for a while. Do not dry them to the point that they become crispy. Color of light: Use different-colored bulbs. Light intensity: Vary the presence or height of the bulb. PRELAB ENGAGEMENT QUESTIONS (Desired student answers and sample facilitation questions in italics.) What is food? Ask students to think about the purpose of food and what it does for the organism. Food is a substance that is later digested and broken apart to give an organism energy. Where do we get food? Ask student what our sources of food are. The things we eat. How is our food created? Ask students where our food is created. Some may say a store; ask them where stores get food. This may lead them to a farm. Ask students where food on a farm comes from. They may say a cow. Ask them where the cow comes from. They may say a mother cow. Ask students where the cows get food. This should lead them to plants. Ask students where food in plants comes from. Tell students this is what they will be investigating over the course of the lesson. PROCEDURE On the day prior to the lab, assign students the homework of placing the procedure steps in the correct order: F, A, C, D, G, E, H, I, B. (The list of procedures is provided in the student guide.) Although students are unlikely to be able to come up with this procedure on their own, having them put the steps in a logical order forces them to think about what they are doing and gives them a better understanding of how to conduct the lab before they do it. Also assign the three prelab engagement questions as homework and ask students to try to generate a data table for the lab based on the procedure. At the start of class, split students into groups of three or four and post the three prelab engagement questions on the board. Give students about five minutes to discuss with their group, and take about five minutes to have groups report their answers to the whole class. Ensure that all groups have the procedure steps in the proper order and point out to students that it is extremely important to use the amounts indicated in the procedure so that they can compare data between groups. Also point out that sodium bicarbonate is baking soda and its purpose is to add carbon dioxide to the solution. Make sure students also know to avoid major veins while hole-punching the leaves. Finally, show students how to remove the syringe plunger and push it until no air is present, only liquid. If students do not do this, their disks will not sink. Tell students that once all disks sink, they need to perform three more 10-second vacuums to keep the class data uniform. Also, explain that as a measure of the rate of photosynthesis, they will observe how long it takes for all 10 leaf disks to float. Tell students they have the remainder of class time to work through the lab. They should share their data tables first with their group and assess each others work for appropriateness. While students are working, walk around and check on their procedures by asking groups questions such as: How much baking soda did you use? How high is your light off the table? How do you get your disks to sink? Did you use soap? What data will you be collecting? How long is the experiment running for? These questions will make students think about what they are doing and check for accuracy. When students complete the experiment, ask them to graph their results and identify any patterns in their data. They should also have a chance to either share their data with the class or at least share it with one or two other groups. In graphing and identifying patterns, students should think about the following: What type of graph should you use? Use the chart provided (Webber et. al 2014). Remind students to incorporate: TAILS: title, axes, interval, labels, scales DRY MIX = dependent/responding variable on y axis and independent/manipulated on x axis What patterns do you notice in your data? What could help explain these patterns? Students should look to see whether photosynthesis increases or decreases with their variable. How close are your results to other classmates? Do your results make sense? For homework after Part A of the lab, assign the three discussion questions and ask students to brainstorm factors that they believe are necessary for a plant to survive. At the start of day 3, review students responses to the Part A discussion questions and what they brainstormed as being plant necessities. Have students share what they came up with and write their answers on the board. Their answers may include: light, light color, carbon dioxide, water, fertilizer, and soil. If soil or fertilizer is mentioned, ask students whether all plants grow in soil. Some students will probably say no and cite water plants that do not need soil. If not, you can mention that some plants, such as duckweed, do not grow in soil but in water; however, these plants still undergo photosynthesis. I also use a picture provided by AIMS Center for Math and Science (see Resources), and pose the question, How did soil affect the plants growth over five years? Students generally do not mention oxygen, as most students believe that plants only take in CO2 and only expel O2. You may have to bring light color into the discussion because that sometimes does not come up. Although you should let students voice all of their ideas, you can help narrow the focus by reminding students of the materials you have available for them to test a variable. Then ask students what variables identified by the class can be reasonably tested with the available materials. Once you have narrowed them down to light intensity (distance of light from the plant), color of light (colored light bulbs), water (drying the leaves), and CO2 (changing the concentration of bicarbonate), have students identify the variable they are interested in testing. Break students into groups (four-student maximum) based on the variables they are interested in testing. Ideally, you will have at least one group per variable. As a group, have students write a focus question for testing a variable of their choice. Discuss what a good focus question is. The things I discuss with students include: testability, independent and dependent variables, and logicalness. Once students have a testable question, have them share it with you for approval. Tell students the tasks they need to complete in class that day: identifying their variables (independent, dependent, and three variables they must keep the same), focus question, and prediction; explaining how they will change the procedure of the lab from the day before to make their new lab work; and organizing a data table. Discuss with students what goes into a good prediction. Ask them the following questions: What is a prediction? (A guess as to the outcome of the investigation.) What goes into a prediction? (An answer to the focus question and an explanation of your thinking [supporting evidence from prior knowledge].) Why do we make predictions? (To help us think about our investigation and use our prior knowledge to generate the best answer, so we can to compare our results.) Tell students that for their procedures, they do not need to write a new plan. They should read through the previous days procedure and explain how they will change it to test their variable. Some groups will have an easier time figuring this out than others. The following are some scaffolding questions to ask groups struggling with how they will test their variable: Carbon dioxide: Ask students what they used to add carbon dioxide to the water in the previous lab (baking soda). Then, ask them how they can change how much carbon dioxide is in the water. Adding some baking soda is fine, but some of my students have hit thresholds at which adding too much baking soda actually hinders the photosynthesis rate. Light intensity: Ask students the following questions: When growing a plant, what are some common things needed? (Many will say water and light.) Where does the light come from? (The Sun.) In yesterdays lab, what was our source of light? (Light bulb.) What is intensity? (How strong something is.) How could you change how intense the light was in yesterdays lab? (Remove light completely; change its distance to the cup.) Removing the light completely gets the best results. If students move the light to closer, it becomes too intense and photosynthesis may not happen or slow down. Light color: Ask students the following questions: When growing a plant, what are some common things needed? (Many will say water, light, or heat.) Where does the light and heat come from? (The Sun.) In yesterdays lab, what was our source of light and heat? (Light bulb.) How we can change how light was used? (Different-colored bulbs make different-colored light, but the same wattage will produce the same amount of heat.) Show student their color choices so they can begin to think about how many trials or colors they want to try. Amount of water: This investigation can give mixed results, as it is hard to isolate the water alone as a variable. I let students go through the lab and find possible the wrong answer, water is not needed then, rethink their investigation after they research the literature and find they are wrong. I also set up some beans in paper towels with and without water to show them that water is necessary ahead of time. For them to build understanding if the indeed find the wrong answer. Ask students the following questions: What is necessary for you to live? (Food, air, water.) How can we change the amount of water in our body? (Drink less). Do you know what dehydration is? How can we dehydrate ourselves? They may answer, Drink less. If so, ask: At what time of year is it easy become hydrated, even if you are regularly drinking water? (Summer.) Why summer? (It is hotter, so we sweat.) Tell students that, just like humans, plants can dehydrate with heat. Ask them to think about how they could remove water from the leaves using this knowledge. Remind students of what is involved in a good data table: title labels of independent and dependent variables organized easy to read Tell students that anything that was not completed in class needs to be completed for homework. On day 3, tell students they will be responsible for completing their investigation and recording their results, analysis, and explanation of their lab. As a quick probe, ask students how many things they should change from day 1s lab (the control lab). Students should change only the variable that they are interested in studying. All students should begin working at the start of class. During this time, walk around and ask groups how they are testing their variables. They should have a good grasp of their procedure, but if not, go back to the scaffolding questions again to help guide them. They may have forgotten what they were doing because they did not complete their homework, and you may have to redirect them to yesterdays focus. When students are done with their investigation, move them to the results and analysis: This section includes graphing, calculations, finding patterns, getting support from others, and confidence in findings. Students need to decide what type of graph best represents their data. I tell them they should only use a bar graph when an axis includes no numerical values. Tell students they should put the data from the control experiment, as well as their current experiment, on the same graph to help their analysis. Students should identify patterns (consistencies in their data). This will give them supporting evidence for their explanation. Note: as sometimes not all of the disks float, it is often advantageous for students to use the median, when 50% of the disks are floating as their comparison. This provides a much more accurate result than when 100% of the disks are floating. After doing their initial analysis, students get together with other groups that have looked at the same variable to compare results. They then beginning looking at the text/online sources to find information that supports/refutes their findings. Students should think about how confident they are in their findings by answering the following: Did you do enough trials?( <3 not confident, 3-5 a little confident, 59 somewhat confident, 10 or more strongly confident) Did others findings support yours? How did you minimize error? What scientific concepts, principles, or ideas support your findings? Once they complete their results and analysis, students should write their explanation. I remind students to include the following in their explanation: Claim: Answer to the focus question. Evidence: Multiple data points and patterns that support the claim. Reasoning: Why does my evidence support my claim, or why is my claim unsupported? Prior knowledge Scientific theories or ideas Support of others Fair/valid test Have students finish their explanation for homework if it is not completed in class. On day 4, start class by having groups share their explanations, graphs, and data with the class, using a projector. Have students record what groups found for each variable, along with the supporting evidence (e.g., removing CO2 slowed photosynthesis down, as after 10 minutes, only one disk was floating). They will need an understanding of all the different experiments to answer the discussion questions. While going through results, allow time for students to ask questions of other groups. Tell students that they will be graded on their answers to the discussion questions, which are based on all of the groups results. Once the discussion is done, have students work with their groups through the 14 discussion questions. Go over the discussion question as a class using the answer key below. Allow students to dispute or correct answers if others in the class disagree. Do not give students the answers; allow them to discuss and come up with an answer themselves. They may change their answers based on class discussion. You may need to use the answer key to probe students with questions to guide them to the answer. On day 5, read the introduction and question from the extension activity: What is the role of photosynthesis in the cycling (moving) of matter and flow of energy into and out of organisms?  HYPERLINK "http://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&docid=NlSms7vNL50FtM&tbnid=Xx6EXuFTW-dg9M:&ved=0CAUQjRw&url=http://www.sikeston.k12.mo.us/skelso/science/producers.htm&ei=Q_miU4HpHpegyATLi4GYDw&bvm=bv.69411363,d.aWw&psig=AFQjCNGCYkVz1Es95QiT35JqpcGYdms-Kg&ust=1403275960974390"  Image from: Living organisms and their environment Create the food web provided in the student guide and picture above in class with 13 students holding a sign of the name of organism they are and a piece of string between them and all the organism they interact with in the ecosystem. The string represents the relationships (arrows). Ask students whether plants need photosynthesis to survive. (Yes.) Why? (Plants use carbon dioxide, light, and water to make food for themselves.) What happens to the light energy taken in during photosynthesis? (It gets transformed into chemical energy.) What does a plant do with the sugars it makes? (Uses them to live and grow or stores them as fats, proteins, or carbohydrates for later use.) What does a food web show? (All the relationships of who eats whom in an ecosystem.) Where do consumers such as humans get the matter and energy needed to live? (From food.) What happens when grass is taken out of the food web? Remove the student representing grass and leave the strings lying on the ground. (The rabbit and grasshopper die.) (Picture of food web added above) Then what? (The mouse dies.) What happens when we remove the tree? Remove the student representing the tree and leave the strings lying on ground. (The caterpillar, deer, and chipmunk die first.) What will happen next? (The bird, fox, hawk, and owl die.) Then what? (The mosquito dies, causing the spider to die.) What happened? (When plants are removed, everything else dies.) What is the initial source of the matter and energy we consumers get for survival? (Photosynthesis.) Have students then write their claim and evidence responding to the focus question. DATA Sample student data Time (min.)ControlNo baking soda (CO2)No lightRed lightGreen lightDried* 1000000200000031003004300600540071065008607700980881010909930-91101040-9111-40-9112-41-9113-43-10114-42--115-52--4*Spinach leaves dried out for 15 min. under light at 30 cm. RESULTS Example of student graphs for all tests *Note that students are only required to graph their trial and the control.  EMBED Excel.Chart.8 \s  Examples of student analysis answers (students may or may not support their results, depending on whether other groups performed the same investigation): We will use a line graph to represent our data because both axes have quantitative observations. For this investigation, we measured how long to get all 10 disks to float. We did not calculate an average. Patterns we notice are that carbon dioxide, water, and light are required for an optimal amount of photosynthesis. Also red light works better than white, which works better than green. We are fairly confident in our results. We only did two trials, one control and one variable. To be more confident, we should complete more trials of each and find an average. To limit error, we only changed one variable at a time. For example, if we took away the light, we made sure to use the same amount of baking soda and did not dry out the leaves at all. We also made sure that after we got the leaves to all sink, we did three more good vacuums to try to keep the error in how well we vacuumed compared to others out. When I did some research online, we found that water, carbon dioxide, and light are necessary for photosynthesis because they are the reactants in the chemical reaction. From previous experiences, I know that plants require water and light because without them in our garden, they die. When you grade the explanations for the lab results, note that students answers may vary, but the pattern of the data should match the example above. Use the rubric provided to grade claims, evidence, and reasoning. DISCUSSION The following are answers students should find in their investigations. WaterCarbon dioxideLight intensityLight colorPresence of water in leaves increases the rate of photosynthesis, as for dehydrated leaves, only four disks were floating after 15 minutes. Presence of carbon dioxide increases the rate of photosynthesis, as when CO2 was removed, only five disks were floating after 15 minutes. Presence of light with a greater intensity increases the rate of photosynthesis, as with no light, no disks were floating after 15 minutes. Red light increases the rate of photosynthesis more than the white light, whereas green light decreased the rate of photosynthesis compared to white, because the time it took 10 disks to float were seven, nine, and 13 minutes, respectively.Answer the following questions using the class data: What factors seemed to speed up and slow down photosynthesis? More carbon dioxide increased it and less decreased it. Less water also decreased it. Light increased it and red light increased it further, whereas green light decreased it. What does this tell you about the things necessary for photosynthesis to occur? Photosynthesis requires carbon dioxide, water, and light that will not be reflected, but absorbed by the green plants. Look at the data for presences of light and light color. What can be said about the importance of light for photosynthesis? Light must be present for photosynthesis to occur. Red light increases the rate the most, whereas green light slows the rate the most. Think about what we learned during the wave unit. Why does the color of the light affect photosynthesis? We see color based on which wavelengths are reflected. If leaves are green, they reflect green wavelengths, so most of the green light gets reflected by the leaves and is not used during photosynthesis. Red light gets absorbed more easily and increases photosynthesis. Answer the following questions using the reading from the cK12 Flexbook on light reactions of photosynthesis (see Resources) and prior knowledge from previous units: Read through the cK12 Flexbook. What is the chemical reaction of photosynthesis? Use the chemical formulas of the substances. Do the reactants for photosynthesis match what we found necessary in question 4 above? 6 CO2 + 6 H2O + Light ( C6H12O6 + 6O2. Yes: carbon dioxide, water, and light. Where does the mass of the products in the reaction come from? How do you know? Supply evidence. The mass of the products comes from the reactants. The reactants and products are both made of carbon, hydrogen, and oxygen. If you do the atomic math, the reactants contain 6 carbon, 18 oxygen, and 12 hydrogen. The products also have 6 carbon, 18 oxygen, and 12 hydrogen. What is the purpose of food? It is anything that organisms break apart and digest to get nutrients and energy. What substance in the reaction is food for plants? Carbon dioxide, light, and water are taken in and are not used as nutrients but rather broken apart through a chemical reaction and built into sugar which can be used as a source of nutrients. In which organelle does photosynthesis take place? Is this organelle found in both plant and animal cells? Can animals undergo photosynthesis? Explain. The chloroplast. The chloroplast is only found in plant cells. Animals cannot go through photosynthesis because their cells do not have chloroplasts. Where do the C, O, and H in sugar and oxygen (the products) come from? The reactants. In most cases, how do sunlight, water, and carbon dioxide get into the plants? Sunlight gets captured by the chloroplast in the leaves, water gets taken in through the roots in most cases, and carbon dioxide enters the leaves through openings called stomata. In which part of the plant does photosynthesis take place? The leaf. What energy transformation takes place in plants? Use the law of conservation of energy to explain this. Light energy is transformed into chemical energy. The law says energy is not created or destroyed; its only transferred or transformed. All the light energy that plants take in is used to react water and carbon dioxide to make sugar and oxygen. This energy is stored in the bonds of sugar and oxygen and is called chemical energy. Plants can store large amounts of food. What evidence is there that supports this? (Hint: What do we use plants for?) Animals can eat plants for food. This proves plants store food, otherwise there would be no benefit to eating them. EXTENSION Claim: Photosynthesis is what creates the usable matter that all animals use as food. The process transforms light energy into usable chemical energy for our bodies. Evidence: When we took away the tree and the grass, which survive due to photosynthesis, everything that ate them, such as the rabbit, grasshopper, deer, chipmunk, and caterpillar, died. When they died, this caused everything else within the web to die as well. For a more realistic example, introduce other possible plants and have a discussion about adaptation with students. ASSESSMENT Assessment of this lab is done by grading the open-ended laboratory using the attached lab rubric (see below). Possible questions for exit tickets or assessments include: Do plants go through photosynthesis at night? Explain your answer. Billy and Suzi are arguing about the initial source of all food and energy for organisms on Earth. Billy argues that our food is made by the animals that we eat. Suzi argues that our food and energy, no matter what we eat, was created by plants through photosynthesis. Who is correct? Draw and use a small food web to help explain your answer. 6 H2O + 6 CO2 + Light energy ( C6H12O6 + 6 O2 Use the equation above to answer the following questions: Where do the atoms that make up sugar and oxygen come from? Provide evidence. The law of conservation of energy states that energy is not created or destroyed, only transferred. What happens to the light energy in this reaction? Explain your answer. Explain in detail how you know that light energy, not heat energy from the Sun, is used in photosynthesis. If most plants grow in soil, how can we say that it is not necessary for a plants life? Use evidence from the lab. Provide reasoning for the following claim: Sugar is food for plants, not carbon dioxide, soil, light, or water. REFERENCES Kestler, N.S. 2014. Middle school science teachers understanding of students misconceptions of photosynthesis and respiration. Masters thesis, State University of New York at Fredonia.  HYPERLINK "https://dspace.sunyconnect.suny.edu/handle/1951/63493" https://dspace.sunyconnect.suny.edu/handle/1951/63493. Michigan Department of Education. 2009. Science v. 1.09 Grade Level Content Expectations. http://www.mimathandscience.org/downloads/science__curriculum_support/k7_complete_documents_20110908_175435_40.pdf NGSS Lead States. 2013. Next Generation Science Standards: For states, by states. Washington, DC: National Academies Press.  HYPERLINK "http://www.nextgenscience.org/next-generation-science-standards" www.nextgenscience.org/next-generation-science-standards. Webber, H., S. Nelson, R. Weatherbee, B. Zoellick, and Schauffler. 2014. The graph choice chart. Science Teacher 81: 3143. RESOURCES AIMS Center for Math and Science: What does a tree eat? -  HYPERLINK "http://www.aimsedu.org/2014/10/29/what-does-a-tree-eat-part-two" www.aimsedu.org/2014/10/29/what-does-a-tree-eat-part-two cK12 Flexbook: Light reactions of photosynthesis www.ck12.org/user:YnN0ZXZlbnNAenBzLm9yZw../book/Life-science/r18/section/16.0 Floating leaf disk assay for investigation photosynthesiswww.elbiology.com/labtools/Leafdisk.html Floating spinach disks activity HYPERLINK "http://www.nsta.org/publications/article.aspx?id=DO0909jAJEA" www.nsta.org/publications/article.aspx?id=DO0909jAJEA Living organisms and their environment HYPERLINK "http://ideasportal.biz/organismsinenviron1.html" http://ideasportal.biz/organismsinenviron1.html Science Investigation Rubric Criteria 4321QuestionStudents question is testable, identifies independent and dependent variables, and related to topic.Students question is testable, variables are not clear, and its related.Students question is either testable, shows variables, or is related.Students question is related but not testable and no variables have been identified.Prediction/hypothesisStudents make a logical inference to the question and also explain why they think that using prior knowledge.Students make a logical inference to the question that doesnt use prior knowledge to explain why they think that.Students make a somewhat logical inference but do not use prior knowledge to explain why they think that.Students make a guess to the question that is not logical and uses no prior knowledge to explain why.ProcedureStudents can create a plan that shows they know what is required for a fair test. It includes things such as what will be observed and collected, materials, is sequential, and what variables will be considered.Students can create a fair test that includes most of the things required for a fair test.Students can create a somewhat fair test that includes some of the things required for a fair test.Students cannot develop a fair test that considers the necessary things required.ObservationsStudents follow procedure to create a table and collect data that is free of bias. Observations are organized and the data collected is appropriate to the investigation.Students follow a procedure to create a table and collect data that is mostly free of bias. Observations are somewhat organized and there may have been more appropriate data to collect.Students follow a procedure to create a table and collect data that is somewhat free of bias. Observations are somewhat organized and there may have been more appropriate data to collect.Students do not follow the procedure and create a table that is disorganized. Some data is collected that by itself is not helpful to answer the question.Data Analysis/EvaluationStudents show careful evaluation and analysis of work by creating appropriate graphs to represent data and use appropriate statistics to summarize data. Students also use scientific terminology, resources, and peers to explain their data and to identify flaws in their design.Students show most of the things necessary for careful evaluation by creating a graph and using statistic to summarize data. Students may use some resources, terminology and peers to help explain their data but not an adequate amount.Students show some of the things necessary for careful evaluation by creating a graph and using statistic to summarize data. Students use few resources, terminology or peers to help explain their data but not an adequate amount. Students do not show the necessary things for careful evaluation. A graph and analysis using statistics is incomplete. Students do not use resources, terminology or peers to help explain their data. Explanation:4321ClaimStudents claim, answers the focus question and is accurate.Students claim, answers the focus question but is missing a minor component.Students claim, is related to the focus question but is unclear and missing several components.Students claim does not answer the focus question or is irrelevant.EvidenceStudent provided many pieces of evidence that support the claim from their data and graph.Students provided some evidence that supports the claim from their data and graph.Students provide a few pieces of evidence that supports the claim from their data and graph.Students dont provided evidence that supports the claim or have not provided anything.ReasoningStudents provided reasoning that links evidence to claim using scientific terminology, peers, and outside sources. Students provided some reasoning that links evidence to claim using terminology, peers, and outside sources but its incomplete. Students provided little reasoning that links evidence to claim using terminology, peers, and outside sources but its incomplete.Students provided very little to no reasoning that links evidence to claim.      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''---  2 z0  --- >2 "0 Michigan state science standards c          (2 0 ontent expectations       2 ?0    2 B0 ( 2 H 0 Michigan     0' .2 x0 Department of Education       2 D0   2 H0 2009   2 p0 )  2 v0    0'@Wingdings- - - - - - @"Arial- - - - - - - - -   2 0  - - -   2 0  --- 2 0 L.OL.07.61:    2 0   s2 E0 Recognize the need for light to provide energy for the production of     0'--- >2 "0 carbohydrates, proteins, and fats.---  2 y0    0'- - -   2 0  - - -   2 0  --- 2 0 L.OL.   2 0 07.62:  2 0   b2 :0 Explain that carbon dioxide and water are used to produce     0'--- >2 "0 carbohydrates, proteins, and fats.---  2 y0    0'- - -   2 )0  - - -   2 )0  --- 2 ) 0 S.IP.07.11:    2 )0   y2 )I0 Generate scientific questions based on observations, investigations, and        0'--- 2 ; 0 research.---  2 ;0    0'- - -   2 P0  - - -   2 P0  --- I2 P)0 S.IP.07.13: Use tools and equipment (stop      )2 P0 watches, meter stick   ,2 P60 s, balance, graduated   0'--- (2 b0 cylinders, beakers)   2 b 0 .---  2 b$0    0'- - -   2 v0  - - -   2 v0  --- 2 v 0 S.IP.07.14:   X2 v30 Use metric measurement devices in an investigation.      ---  2 v@0    0'- - -   2 0  - - -   2 0  --- 2  0 S.IP.07.15:    2 0   ^2 70 Construct charts and graphs from data and observations.  ---  2 W0    0'- - -   2 0  - - -   2 0  --- 2  0 S.IP.07.16:    2 0   12 0 Identify patterns in data   2 0 .---  2 0    0'- - -   2 0  - - -   2 0  --- 2  0 S.IA.07.11:   82 0 Analyze information from data       F2 '0 tables and graphs to answer scientific     0'--- 2  0 questions.---  2 0    0'- - -   2 0  - - -   2 0  --- 2  0 S.IA.07.12:    2 0   q2 D0 Evaluate data, claims, and personal knowledge through collaborative         0'--- &2 0 science discourse.---  2 0    0'- - -   2 0  - - -   2 0  --- 2  0 S.IA.07.14:    2 0   +2 0 Draw conclusions from       2 0   :2 0 sets of data from multiple tria     (2 L0 ls of a scientific    0'--- 2  0 experiment   2 0 .---  2 0    0'- - -   2 '0  - - -   2 '0  --- 2 ' 0 S.IA.07.15:    2 '0   y2 'I0 Use multiple sources of information to evaluate strengths and weaknesses           0'--- 82 90 of claims, arguments, or data.    ---  2 9e0    0'- - -   2 N0  - - -   2 N0  --- 2 N 0 S.RS.07.1:    2 N0   s2 NE0 Evaluate the strengths and weaknesses of claims, arguments, and data.       ---  2 N0    0'- - -   2 b0  - - -   2 b0  --- 2 b 0 S.RS.07.13:    2 b0   b2 b:0 Identify the need for evidence in making scientific decisi     2 bb0 ons.---  2 b{0    0'- - -   2 v0  - - -   2 v0  --- 2 v 0 S.RS.07.14:   2 v0 Eva   2 v0 l t2 vF0 uate scientific explanations based on current evidence and scientific        0'--- 2  0 principles. ---  2 0    0'- - -   2 0  - - -   2 0  --- 2  0 S.RS.07.15:    2 0   j2 ?0 Demonstrate scientific concepts through various illustrations,         0'--- R2 /0 performances, models, exhibits, and activities.   ---  2 0    0'@Times New Roman- - - - - -   2 `0   @Times New Roman- - - - - -  --- 0,A OV`(VOƄBƄ!JBBBBֵ1ƄƄ!!΄ޥƥֵcB1֥Bֽƥ!BcB!BB A@ 0 ?>  =;  <:;78956 234  1 & 0   / !!!!   !!!!!!.  - "!!!!!!!!!    !!!!!!!!!!! +, !!!!!!!!!!!!!  !!!!!!!!!!!!! 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''---  2 z0  - - -  72 0 Next Generation Science Stand          2 0 ards  --- %2 0 (NGSS Lead States       2 B0 ,  2 G0   2 J0 2013)   2 w0    2 z0    0'- - -   2 0  - - -   2 0  --- 42 0 LS1.C: Organization of Matt      :2 `0 er and Energy Flow in Organisms     ---  2 40    0'@1Courier New- - - - - - - - -   2 0 o - - -   2 0  --- 2 P0 Plants, algae (including phytoplankton), and many microorganisms use the energy           0' 2 M0 from light to make sugars (food) from carbon dioxide from the atmosphere and         0' 2 & 0 water thr  j2 &?0 ough the process of photosynthesis, which also releases oxygen.    2 &0   2 &0 These   0'--- [2 950 sugars can be used immediately or stored for growth o     2 90 r  2 9!0   2 9% 0 later use.---  2 9^0    0'- - -   2 M0  - - -   2 M0  --- "2 M0 PS3.D: Energy i    2 M0 n a  2 M$0   2 M(0 Chemi   :2 MO0 cal Processes and Everyday Life   ---  2 M0    0'- - -   2 `0 o - - -   2 `0  --- P2 `.0 The chemical reaction by which plants produce     2 ` 0 complex food   2 `J0   2 `P0 molec   2 `t0 ules (sugars)    0' 2 r 0 requires an  2 r0   =2 r !0 energy input (sunlight) to occur.   2 r0   C2 r%0 In this reaction, carbon dioxide and   0'--- 52 0 water combine to form carbon     2 0 - L2 +0 based organic molecules and release oxygen.  ---  2 0    0'- - -   2 0  - - -   2 0  --- 2 0 MS   2 0 - 2 0 LS1   2 0 :  2 0   [2 50 From Molecules to Organisms: Structures and Processes       ---  2 P0    0'"Systemp|)--  00//..)} @http://www.aimsedu.org/2014/10/29/what-does-a-tree-eat-part-twou) @http://www.nextgenscience.org/next-generation-science-standards ^6https://dspace.sunyconnect.suny.edu/handle/1951/63493=J4http://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&docid=NlSms7vNL50FtM&tbnid=Xx6EXuFTW-dg9M:&ved=0CAUQjRw&url=http://www.sikeston.k12.mo.us/skelso/science/producers.htm&ei=Q_miU4HpHpegyATLi4GYDw&bvm=bv.69411363,d.aWw&psig=AFQjCNGCYkVz1Es95QiT35JqpcGYdms-Kg&ust=1403275960974390 Item +Properties0UCompObj6r   F Microsoft Word 97-2003 Document MSWordDocWord.Document.89q^ 2 0@P`p2( 0@P`p 0@P`p 0@P`p 0@P`p 0@P`p 0@P`p8XV~_HmH nH sH tH @`@ NormalCJ_HaJmH sH tH Z@Z = Heading 1$<@&5CJ KH OJQJ\^JaJ DA`D Default Paragraph FontRi@R  Table Normal4 l4a (k (No List 4@4 hHeader  !4 @4 hFooter  !.)@. h Page Numberj#j e Table Grid7:V06U`16 j Hyperlink >*B*phB'`AB  Comment ReferenceCJaJ<@R<  Comment TextCJaJ@j@QR@  Comment Subject5\H@rH  Balloon TextCJOJQJ^JaJ^@^  List Paragraphd^m$CJOJQJaJfof T|*Default 7$8$H$1B*CJOJPJQJ^J_HaJmH phsH tH O# */ Table Grid17:V0CJOJPJQJ^JaJ:/: {Comment Text CharFV`F \pFollowedHyperlink >*B*phPK![Content_Types].xmlN0EH-J@%ǎǢ|ș$زULTB l,3;rØJB+$G]7O٭V$ !)O^rC$y@/yH*񄴽)޵߻UDb`}"qۋJחX^)I`nEp)liV[]1M<OP6r=zgbIguSebORD۫qu gZo~ٺlAplxpT0+[}`jzAV2Fi@qv֬5\|ʜ̭NleXdsjcs7f W+Ն7`g ȘJj|h(KD- dXiJ؇(x$( :;˹! 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