Answer Now and help others. Photosynthesis Lab. Comments. Students understand the principle of photosynthesis and the factors affecting photosynthesis. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. In introductory biology courses, such as this one offered on Udemy, photosynthesis not only makes up an important part of the lesson material but is also ideal subject matter for an easy experiment. AP05EXPERIMENT Photosynthesis • Sodium Bicarbonate (baking soda) • Liquid soap • Plastic syringes • Transfer pipets • Plastic cups Store the entire experiment at room temperature. University. Experiment: Objective: To show experimentally that light is essential for photosynthesis. AP Biology: 2nd hour. The chloroplast is most abundant in the cells of the plant leaves. Experiment to demonstrate that photosynthesis causes increase in dry weight: 8. The dye is reduced only in one of the tube which is exposed to light; while in the other tube which is covered with a black paper the dye remains blue-coloured. Now add 2 drops of 2,6-Dichlorophenol indophenol dye in both the test tubes. 6. Created by. 1. In this virtual photosynthesis lab, students can manipulate the light intensity, light color, and distance from the light source. Introduction: Photosynthesis and respiration Photosynthesis is the process by which light energy is used to produce oxygen, glucose, and One improvement to the experiment would be keeping precise measurements of the amount of distilled water added or the amount of sodium bicarbonate mixed in order to keep any accurate results. 2. Experiment to demonstrate that oxygen is evolved during the process of photosynthesis: 3. Learn. This shows that CO2 enters the leaf through stomata during photosynthesis. Photosynthesis is the process by which plants convert energy from the sun into the energy they need to survive. Cut two leaves from such a de-starched plant in which the stomata are present only on the lower surface. Test. Cut the bases of the Hydrilla plants, tie them with a thread and insert them in the narrow tube of the bubbler in such a fashion that their cut ends are towards the upper side as shown in the Fig. Fill a test tube with the water and invert it on the upper end of the funnel. Starch grains are stained blue. 3. After some time, candle extinguished and the rat died. Plot and interpret the data you obtain from your experiment. The below mentioned article includes a collection of ten experiments on photosynthesis for high school. Gravity. The first is the light reaction, which creates the energy for the second stage, which is known as the Calvin cycle. 2. 6. Elodea plant, the chemical . In order to do this, you will use an . 4. 2. Spinach or gram leaves, grinding medium, grinder, centrifuge, test tube, linen, dye, black paper, etc. 39). Place the beaker, along with the leaves, in bright light for at least four hours, and then wipe off as much vaseline as possible with a soft rag. Photosynthesis is an important part of any biology test, and you can get help preparing for your exams with Udemy’s GCSE Biology course. 4. 36). Share Your PPT File. The carbon dioxide for the process is likewise brought in from the atmosphere. Ganong’s light screen, a potted plant and iodine. Thus, it can be concluded that CO2 is necessary for this process. With the help of a sharp cork borer punch out about 10 pieces from the half part of a de-starched leaf, still attached to the plant (cork borer should be used against a wooden block, and care should be taken so that large veins are not injured during punching). Arrange all readings of different conditions in the form of tables as follows: Table I indicates that by adding sodium bicarbonate in the water the number of bubbles increases. Sodium bicarbonate is added for increasing the amount of CO2 in the water and so it can be concluded that the rate of photosynthesis increases by increasing the quantity of CO2, but only till the light or some other factor starts to act as a limiting factor. Site: bit.ly/pholab (you can type "glencoe photosynthesis" into a google search to find this resource) - Read the summary in the side bar which explains how colors of light affect plant growth. 38. Stain the leaf with iodine to test for the presence of starch. 4. 5. 4. Content Guidelines 2. Welcome to BiologyDiscussion! On the other hand, the leaf, on which the vaseline was applied on the lower surface, shows negative test for starch, i.e., blue colour does not appear. You also need liquid soap and a plastic syringe of at least 10 ccs, with any needle removed. Some bacteria go through photosynthesis as well, and these proteins are present in their plasma membrane. There are two stages in photosynthesis. Experiment to compare the rate of photosynthesis under different conditions with the help of Wilmott’s bubbler: 4. Students will analyze data,write a report using the scientific method, and apply results to current environmental issues. Experiment -Measurement of Photosynthesis There are various set-ups that can be used to measure the rate of photosynthesis, each relies on counting the oxygen produced during the reaction. With the observations of Table IV, it can be concluded that the rate of photosynthesis increases by increasing the temperature. Experiment to demonstrate that carbon dioxide enters the leaf through the stomata: 7. You want to use a leaf with a surface that is not too thick and is fairly smooth, without much hair. Then the carbon dioxide experiment was to see how easily plants are effected by the amount of carbon dioxide in n their surroundings. Because the ultimate product of photosynthesis is starch, hence it can be concluded that it is formed only in those regions which remain exposed to sunlight and not in others. Experiment Components Requirements • Leaves (i.e. 2. IntroductionThis lab has been created in order to find what extent does distance from a light source (5cm, 10cm, and 15cm) affect the rate of photosynthesis (measured in bubbles / 3 min) in Elodea water plants. Take also the readings of bubbles covering the bubbler with green and blue coloured papers in a definite time. (With Methods)| Industrial Microbiology, How is Cheese Made Step by Step: Principles, Production and Process, Enzyme Production and Purification: Extraction & Separation Methods | Industrial Microbiology, Fermentation of Olives: Process, Control, Problems, Abnormalities and Developments. Photosynthesis Lab Connection to Class : This experiment recounts the unit of photosynthesis. Experiment: 1. Fix up the apparatus afresh and now cover the bubbler with red paper and note the number of bubbles in definite time. 1. Lab Photosynthesis Laboratory objectives: Learn about photosynthesis. Photosynthesis is the process by which plants, algae, some bacteria, and other organisms convert light energy and carbon dioxide into oxygen and glucose. Experiments about photosynthesis … The liberated gas comes in the intercellular spaces and ultimately evolves out through the stomata. 4. They were blocked due to vaseline application. Experiment to show the effect of different wavelengths of light during the process of photosynthesis: 5. One of the most popular photosynthesis experiments is the floating leaf experiment. A large ‘Ganong’s light screen’-like box in which the leaf can be inserted, glass top covered with blue, green and red colours, plant twig, stand, iodine, etc. You can create control solutions by infiltrating the disks with different solutions, such as only water or water and soap with no bicarbonate. Put these punched pieces in an oven at 86°C and determine their dry weight. Students will be able to do the experiment more accurately in the real lab once they understand … Disclaimer Copyright, Share Your Knowledge Due to this light screen, some parts of the leaf are covered whereas other remaining parts are exposed to light. Our mission is to provide an online platform to help students to share notes in Biology. Gravity. 2 2. 5. 1. When a tadpole turns into a frog, its tail shrinks and is reabsorbed. Understanding photosynthesis can do more than get you a good grade on your exam. 3. What are the characters Mendel selected for his experiments on pea plant? 4. Record the optical density (O.D.) Add a small amount of the bicarbonate solution to the leaf disks in the syringe to infiltrate the leaves with the solution. of the grinding medium. (When the tube is exposed to light it must be placed in an ice cold water bath so that chloroplasts may not be damaged). 4. However, once the air spaces in the leaf becomes infiltrated with a bicarbonate solution, the density of the leaf increases, causing it to sink. Cut the bases of the plants, tie them with a thread and cover them with an inverted funnel in such a fashion that the cut ends of plants are towards the neck of the funnel (Fig. Share Your PDF File As photosynthesis begins, oxygen is released into the interior of the leaf. STUDY. Create a vacuum and swirl the disks, then decrease the vacuum until the disks sink. You might have to try a few times. Treat the leaves or filaments with chloral hydrate and iodine. Experiment 6: Photosynthesis. In 1770, after a series of experiments, Joseph Priestley came to a conclusion regarding the essentiality of air for photosynthesis and also for the growth of plants. Experiment to determine the amount of chlorophyll ‘a’, chlorophyll ‘b’ and total chlorophyll in a given plant tissue: 6. 2. With water, light energy from the sun, and carbon dioxide from the air, photosynthetic organisms are able to build simple sugars. 2. That the chlorophyll is also an essential requirement for photosynthesis can be shown by testing starch in a variegated leaf. Now take the pellet and suspend it in 50 ml. Terms in this set (13) Photosynthesis. Privacy Policy3. Fill a Wilmott’s bubbler with pond water. You will therefore need a way to calculate a rate of photosynthesis. Beaker, water, test tube, funnel, Hydrilla plant. Is this an example of necrosis or apoptosis? Using the floating disk technique in our experiment to measure the rate of photosynthesis, spinach leaves will be submerged in a concentration of CO2 and a concentration of water. Detach the leaf after a few hours. This indicates that photosynthesis increases. In this lab, you will investigate the process of photosynthesis. Photosynthesis Experiments are centered on the investigation of two areas pertaining to photosynthesis: factors that affect the photosynthetic process; and cellular structures or substances involved in photosynthesis. Process that converts carbon dioxide into sugars such as glucose using energy from the sun. Experiment to demonstrate the dye-reduction by chloroplast: 9. Centrifuge the samples of the so-formed pulpy material and take the supernatant. Experiment to Prove Light is Essential for Photosynthesis (With Pictures ), Experiments on Carbohydrates | Biochemistry. This lab was created to replace the popular waterweed simulator which no longer functions because it is flash-based. When the dye is oxidized, it is blue. Which part of the male reproductive system store the sperm? The amount of chl ‘a’, chl ‘b’ and total chlorophyll is determined by the under mentioned method proposed by Anderson and Boardman (1964): 1. There are other photosynthesis experiments you can do, such as covering up one of the leaves of a live plant using black construction paper. Finally, you need a hole punch, plastic cups, a timer, and a light source. Negative test of starch, which is also shown by the portion of the leaf present in between the split of the split cork, can be explained that it is due to the lack of CO2 and light, thus indicating that both of them are essential requirements. Experiment 2 lab report. PLAY. Through experiments, students determine that carbon dioxide, light, and chlorophyll are three of the necessary components of photosynthesis. Wilmott’s bubbler, water, Hydrilla, vaseline, papers of red, blue and green colours, heater, sodium bicarbonate, thermometer, etc. 3. In this experiment, the leaves will only rise to the surface when enough CO2 and light is present to allow the leaf disks to carry out photosynthesis and produce O2. Write. It is an essential part of the life cycle, and the reason that plants are at the bottom of the food chain. of spinach or gram leaves and grind them in about 20 ml of grinding medium (0.25 M NaCl, 0.1M K2HPO4). Take a potted plant and make its leaves destrached by keeping it in dark for one or two days. Photosynthesis Virtual Lab Site 1: Glencoe Photosynthesis Lab "Which colors of the light spectrum are most important for plant growth?" Darkest staining in the red region indicates that maximum photosynthesis has taken place in this region. You want to add a drop of diluted liquid soap to the solution as well, as this will wet the hydrophobic surface of the leaf so that the solution will be drawn to the leaf. Place a potted plant in darkness for about 24 hours. Flashcards. Photosynthesis is a chemical reaction that’s vital to most life on Earth. How do they work? Negative staining in the green region indicates that photosynthesis process has not taken place in this region. Photosynthesis experiments can be done with minimal supplies, so even children can enjoy and learn. Since DPIP replaces NADPH in the light reactions, it will turn from blue to colorless when reduced during photosynthesis. Federation University Australia. Photosynthesis Lab. This indicates that photosynthesis has taken place in this region also, but it happened at a lower rate than that of red region. The dependent variable is the rate in which the spinach disk would undergo photosynthesis; this is because of the need for carbon dioxide to allow the Calvin Cycle to produce the necessary molecules needed for photosynthesis. Fix a de-starched leaf below the glass top of the box and keep the apparatus in sunlight (Fig. 1. This activity is a lab where students design an experiment to test the rate of photosynthesis. Photosynthesis is one of the most important anabolic chemical reactions that allows life to exist on Earth. For the second time, he kept a burning candle, rat, and a green plant together in the bell jar. 2. Teachers often use this experiment, and then have their students write a biology essay about their findings. 1. Observations of the Table II Indicate that the number of bubbles is more in sunlight than in shade, and so it can be said that photosynthesis is more in sunlight in comparison to shade. Determine the dry weight of these punching’s also by putting them in oven at 86°C. One of the most popular photosynthesis experiments is the floating leaf experiment. 1. Plant Respiration and Photosynthesis - High School Lab Experiments | PASCO PASCO Live streaming weekly on Facebook & YouTube » Use the hole puncher to cut out 10 or more disks from the leaves. of tissue. Fresh green plant material (e.g., spinach leaves), mortar, pestle, 80% acetone, centrifuge. Design an experiment to test how light affects photosynthetic rates. Cut elodea stems at an angle and use your fingers to crush the end of the stem. Compare the intensity of starch in the three parts of the leaf. A plant is shown in a beaker and test tube which bubbles to indicate the rate of photosynthesis. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product. The first thing you need to do is to create the bicarbonate solution, which needs to just be about 0.2 percent solution. 2. You can compare results and discover the net photosynthesis time. Then, put the disks and the solution into a clear cup, adding more bicarbonate solution. Materials required: A bell jar, candle, rat, and a plant. The leaf part receiving red light is darkly-stained while that receiving blue light is next in the order. 3. Take known amount of fresh green plant material, crush it and dissolve it in 80% acetone with the help of a mortar and pestle. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. Each species undergoes photosynthesis slightly differently, but the basic process is the same. Increase a definite quantity of sodium bicarbonate with definite interval and note the increase or decrease in the number of bubbles. You will notice how the leaf that lived without the sun will be less vibrant than those exposed to light, which demonstrates the necessity of sunlight in photosynthesis. Ivy is one of the best leaves for this experiment, and spinach works well also. Learn. Photosynthesis Experiments for Kids. Course. Amounts of chlorophyll ‘a’, chlorophyll ‘b’ and total chlorophyll are calculated according to the following formulae: Chlorophyll ‘a’, chlorophyll ‘b’ and total chlorophyll amounts are expressed in terms of mg/gm. Cellular respiration occurs at the same time, which causes it to consume oxygen. 1. PLAY. Second darkly-stained region is the blue region of the leaf. 3. De-starch a potted plant by putting it in complete darkness for two days. 10. When reduced, however, it turns colorless. Test. Therefore, the CO2 entered the leaf through the stomata present on its lower surface and the starch was formed. Students understand the concept that light is necessary for photosynthesis. Only green portions of the leaf show positive starch test. From the cut ends of the plant some bubbles are coming out continuously and they are collected at the top of the test tube by displacing the water. Place the leaf disks under the light source. To redo the experiment, click on the ‘Reset’ button. Method: 1. Take about 5 gm. Teachers often use this experiment, and then have their students write a biology essay about their findings. It can also make you a better gardener, as you will understand what plants need and how to adjust certain elements to make them thrive. This makes the rate of the disk rise an indirect measurement of the net rate of photosynthesis. Negative starch test by the leaf portion present inside the bottle indicates that process of photosynthesis is absent in this region. Photosynthesis : the lab - discussion & conclusion. Filter in through very thin layers of linen. Please sign in or register to post comments. Pour about 5 ml of the suspension in two separate test tubes. In the black paper or black tin foil disc of the screen, cut a pattern of some kind (like P) and fix it on the screen. Note: Oxygen is the by-product of photosynthesis. This is not an example of … STUDY. the rate of reaction, O2 production, amount of leaf disks that float to the surface. Wait until all of them are floating and record how long it takes. Apply vaseline on the lower surface of one leaf and on the upper surface of the other leaf. iran_gutierrez. Write. 1. Flashcards. 1. Again fix up the apparatus in the same way as discussed above. Helpful? Dip the petioles of both the leaves in water in a beaker. What is the significance of transpiration? A higher number of oxygen bubbles indicate a higher rate of photosynthesis, whereas lesser number of oxygen bubbles indicates a lower rate of photosynthesis. Create an online video course, reach students across the globe, and earn money. Cover one of the test tube with black paper so that it may not get light while the other tube is exposed to light. Bromothymol Blue (which acts as an indicator to show if photosynthesis is occurring). The Floating Leaf Experiment. Oxygen gas is given off as waste during the process, and water is often used in the process as well. Apparatus and materials required: A healthy potted plant, a petri dish, a beaker containing water, forceps, a water bath, a piece of wire gauze, a tripod, a burner, a box of matches, alcohol a strip […] Photosynthesis is the process in which plants convert light energy, water and … Related documents. The observations indicate that the iodine test is positive only in the regions of the leaf which were exposed to sunlight (P) while on the other hand the unexposed regions show negative iodine test for starch. Share. Therefore, CO2 could not enter the leaf, and hence no starch formation takes place. Result. Fill the beaker with the water and take an aquatic plant, such as Hydrilla, in the beaker. You have learned that photosynthesis involves the conversion of carbon dioxide and water into organic molecules such as glucose. 5. 4. How this experiment works is that you take a leaf disk, which naturally floats. 1. This is the equivalent of about 1/8 of a teaspoon of baking soda in 300 milliliters of water. 3. There is an increase in the dry weight of the similar number of punching’s taken from the plant which was kept in sunlight for 8-10 hours. Positive test of starch shown by the portions of the leaf present outside the bottle indicates that photosynthesis process is continuously going on there because all the essential requirements, i.e., light, chlorophyll, water and CO2 are readily available to this portion. A potted plant, caustic potash, wide- mouthed bottle, iodine, split cork, water. Keep the whole apparatus in sunlight and observe for some time. You can also use leaves of different ages to further the experiment. The leaf part receiving green light shows negative staining for the starch. This affects how successful photosynthesis was at the time. The leaf, on which vaseline was applied on the upper surface, shows positive test for starch by becoming blue coloured. Getting Started The first step in developing your model is to design and carry out a series of experiments to deter-mine how temperature and light intensity affect the rate of photosynthesis. He observed that neither the candle got extinguished, nor did the … Principles of Biology (SCBIO1010) Academic year. Leave it on for a few days, and then compare it to the rest of the leaves. On testing this gas it is found that it is oxygen. A de-starched large-leaved plant, cork borer, wooden block, oven, weighing balance. Yeast: Origin, Reproduction, Life Cycle and Growth Requirements | Industrial Microbiology, How is Bread Made Step by Step? 3. These are just a few of the many easy and fun biology experiments you can do to understand the fundamentals of biology. Typically, the plants take energy from the sun to convert the carbon dioxide molecules (carbon and two oxygen atoms) into glucose molecules, which are made up of carbon, hydrogen and oxygen. Animals depend on plants for food and to convert carbon dioxide into oxygen. Again fix up the apparatus afresh and now instead of adding any substance or covering the bubbler with coloured papers, keep it near the electric heater. Home — Essay Samples — Science — Experiment — Lab experiments with photosynthesis This essay has been submitted by a student. In doing so, oxygen is a product while carbon dioxide is a reactant that is used up during photosynthesis. Anna Dang, Isabel Nowak, Arifa Syeda. The liberated gas is oxygen and it is evolved due to the photolysis of water under the process of photosynthesis. Make the final volume of each sample to 5 ml with the help of 80% acetone. 2. So, light is essential for photosynthesis. Created by. ... How can the experiment be improved? In the region of the letter ‘P’ the leaf shows positive iodine test (Fig. This portion of leaf is getting all the essential requirements, i.e., light, chlorophyll and water except the CO2 because the latter is absorbed by the caustic potash. Take a potted plant and make its leaves destrached by keeping it in dark for one or two days. To improve results, add a pinch of baking soda to the water in the test tube. It will make its leaves de-starched. Place the plant in sunlight for 8-10 hours, and then take the similar number of punching’s from the other half of the leaf. Spell. Experiment Ideas for Photosynthesis. Follow all normal lab safety rules. The chlorophyll is removed. This alters the buoyancy again, making the leaf disks float again. 2. 3. In this process, plants use the sun, carbon dioxide and water to create food energy. (C) The readings show that the rate of photosynthesis is the highest in red light and lowest in green. Put the leaf disks in into the barrel of the syringe, with only a small volume of air, less than 10 percent. Fill partly a wide-mouthed bottle with strong solution of caustic potash and fit a split cork on its mouth. A de-starched plant having stomata only on lower surface of leaves, vaseline, beaker, water, iodine, soft rag. what is the dependent variable. Use your timer, and at each minute, record how many leaves are floating. 37). You should have a similar depth of solution in each trial, around 3 centimeters. (D) This experiment shows that photosynthesis occurs at a rapid rate from 10 to 35°C, provided other factors are not limiting. Before sharing your knowledge on this site, please read the following pages: 1. Take a slide and put either a few Moss leaves or Spirogyra filaments on it. You can get help with your essay writing with Udemy’s A+ Research Paper in Biology course. Too much increase in temperature will show negative effects on photosynthesis and ultimately the plant will die in high temperature. 2. A molecule in the chlorophyll absorbs a photon from the light and loses an electron, which is passed on into the electron transport chain that ultimately reduces NADP to NADPH, which is necessary for the Calvin cycle and creates ATP, an energy also required for the Calvin cycle. The starch grains turn blue on addition of iodine, indicating the fact that starch is present in chloroplast. 5. More specifically, you will learn how the amount of light affects photosynthesis. You can get help with your essay writing with Udemy’s A+ Research Paper in Biology course. 2016/2017. TOS4. Photosynthesis Lab: the Lab- Variables. Exp 2 Photosynthesis - Experiment 2 lab report. Note the readings in different temperatures. 34). dark, low, high light. The chromatography experiment was designed to see the different pigments in plants and which determines how much sunlight is let in. Get a subscription to a library of online courses and digital learning tools for your organization with Udemy for Business. So, green wavelength is ineffective in photosynthesis. Match. And this has finally resulted in the largest accumulation of starch in this region. // Provide alternate content for browsers that do not support scripting // or for those that have scripting disabled. Carbon fixation. The purpose of this experiment was to determine the effect of sodium bicarbonate on the rate of photosynthesis of spinach leaf disks. The plants absorb the energy of light by proteins, held inside organelles known as chloroplast, with green chlorophyll pigments. A bicarbonate ion is one of the carbon sources for photosynthesis. Developing Cultural Humilit 1 Mendelian Genetics BIO 110 Test 1 Summary Biology Test 2 Summary Exam 4 Fall 2016, questions and answers University of Delaware Biology 207 Notes for Whole Semester Experiment, Botany, Photosynthesis, Experiments on Photosynthesis. It is because the stomata were present only on the lower surface. What are complement proteins? Care should be taken so that the leaf is not damaged during wiping of the vaseline. Match. Professional scientists, children learning the fundamentals of science, and every level in between use experiments to learn more about a particular subject matter. Chloral hydrate, iodine, Spirogyra filaments or Moss leaves, slides. During the light reaction, the energy from light is converted to the chemical energy needed for the secondary process of photosynthesis. For this experiment, you need sodium bicarbonate, which is better known as baking soda, and some leaves. Priestley kept a burning candle and a rat together in the single bell jar. 7. In an introductory biology class, students will learn about plant photosynthesis and can find ways to observe it in their everyday lives. Terms in this set (19) what is the independent variable for this experiment. Students use a carbon dioxide sensor to measure the rates of photosynthesis and respiration in spinach leaves. Experiment to demonstrate that light is necessary for the process of photosynthesis: The best answers are voted up and rise to the top. Fix a … for each sample at two wavelengths, i.e., 663 nm and 645 nm. You do not want a sudsy soap; if you find you get suds, add more baking soda. Fix a leaf of this plant in between the Ganong’s screen. You can also learn more about gardening through taking an online gardening course such as that offered by Udemy. Experiment to demonstrate Moll’s half-leaf experiment for showing that CO2, light, chlorophyll and water are necessary requirements for photosynthesis: 2. Add some definite quantity of sodium bicarbonate in the water and note the number of bubbles coming out in definite time. Due to the application of the reagent the chlorophylls and starch grains are separated. In this experiment, a blue dye (2,6-dichlorophenol-indophenol, or DPIP) will be used to replace NADPH in the light reactions. Place the whole apparatus in light after applying grease on the upper portion of split cork, and test the leaf for stach after about 10 hours. In the first experiment, we will be using the same plant you examined in Lab 3 called Elodea. This experiment is designed for 10 lab groups. spinach, ivy, pokeweed) • Timer tmarko98. 2. Udemy’s A+ Research Paper in Biology course, Options Trading: Everything you Need to Know, Ace Your Interview With These 21 Accounting Interview Questions, Learn How to Write a Book in 8 Easy Steps, Photosynthesis Experiment: Making Science Fun. ADVERTISEMENTS: Experiment to Prove Light is Essential for Photosynthesis! Remove the leaf from the screen after a few hours, and test for starch with the help of iodine. Spell. Table III shows that the photosynthesis is highest in red light while lowest in green light. 2. 5. This indicates that when the destrached plant was kept in sunlight, photosynthesis took place, and resulted in an increase in dry weight of the plant. With iodine to test for starch by becoming blue coloured papers in beaker. P ’ the leaf is not an example of … students understand the fundamentals of biology and a light.! Use your timer, and these proteins are present only on the upper surface, shows test... 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