Little learners can explore the basic ingredients of plant life by tracing, coloring, and completing diagrams. Note: Before beginning this activity, use scissors to make an Elodea cutting for each group, cutting the stems in between the leaf nodes. Photosynthesis, derived from the Greek words photo, meaning "light," and synthesis "putting together," is a process used by plants and some bacteria to harness the energy from sunlight to convert water and carbon dioxide to produce sugar (glucose) and oxygen. CO2 concentration (BTB color indicator number) 0 6 7 8. Phosphoglyceric acid and sugars account for 27% of the label during similar exposures. However both ways will demonstrate how photosynthesis produces oxygen, and cellular respiration uses oxygen and create Carbon dioxide. More specifically, you will learn how the amount of light affects photosynthesis. Please check your test tubes and use the data to complete your Data Table and Graph on the back of your Lab Sheet. No matter your students' level, we have an activity to stretch their scientific knowledge. The rate of photosynthesis varies greatly with changes in wavelengths of light. Prepare a wet mount of an Elodea leaf with aquarium water. Bromothymol Blue (which acts as an indicator to show if photosynthesis is occurring). ©2008 CIBT Photosynthesis and Respiration in Elodea – Student Section Page 2 Purpose: Your lab group is asked to design, execute, and analyze an experiment that tries to accomplish the following two tasks: Task A. More advanced students can dive deeper into understanding the plant life cycle, chemistry, and biology in our photosynthesis worksheets. During the ‘light-independent reactions’, carbon dioxide, taken in from the air, is combined with hydrogen and ATP to form a range of organic molecules for the plant. 4. This test can be done with and without snails. Tube 3 will be the Elodea in the light. Censullo Monica Mendoza Saul Longoria... Inhibition Of Direct Light Affects Elodea 's Co2 Production During Photosynthesis. It starts as a blue solution in water, and turns yellow in the presence of carbon dioxide. Click: Elodea and snails; Just Elodea; Question s Test Tube Treatment. Assemble the equipment needed to measure the rate of photosynthesis in elodea (water plant). The Floating Leaf Disk Assay for Investigating Photosynthesis Introduction: Trying to find a good, quantitative procedure that students can use for exploring photosynthesis is a challenge. 2. ATP and hydrogen ions and electrons are used in the second stage of photosynthesis, the ‘light-independent reactions’. to investigate ecophysiological implications of recent biochemical evidence for significant levels of C 4 photosynthesis in this plant, a pathway normally associated with low photorespiration and high photosynthetic efficiency. Learn vocabulary, terms, and more with flashcards, games, and other study tools. In order to do this, you will use an . // Provide alternate content for browsers that do not support scripting // or for those that have scripting disabled. In this experiment I use a plant called Elodea (pond weed). Instruct students to work in groups of 2-3 students to conduct the Photosynthesis in Elodea lab. They use this technique to compare the amounts of photosynthesis that occur under conditions of low and high light levels. Cover Tube 1 with tin foil (there is no Elodea in Tube 1) and place it in the test tube rack. Experiments to determine the early labeled photosynthetic products in Elodea canadensis show that after 2 seconds of exposure to NaH 14 CO 3, 45% of the 14 C incorporated is located in malate and aspartate. Count bubbles of oxygen gas given off by elodea to determine the rate of photosynthesis. 1) Cut a segment of the Elodea plant approximately 8cm with scissors. To do this, use a soaked “Q-Tip” to place a drop of aquarium water towards one end of the slide. Using forceps remove a small leaf from the tip of an Elodea plant and lay … Bromothymol blue works because it is able to detect the presence of . Photosynthesis - Resources: Demonstrating oxygen formation during photosynthesis can be a tricky process. CO. 2 (needed for photosynthesis) and . 1) Aquatic plant (Elodea) 2) Test tubes 3) Watch 4) Water (at room temperature) 5) Lamp (light source) 6) Knife/Scissors 7) Rulers 8) baking soda Procedures. Photosynthesis and respiration; Description What is the photosynthesis equation? Standard error: 0.84 for RuDP Carboxylase and 0.72 PEP Carboxylase. Photosynthesis, respiration, and release of organic carbon were examined using 14 C in the freshwater angiosperm Elodea canadensis Michx. In this inquiry lab, students design and conduct simple experiments using elodea and Bromothymol blue to determine whether plants consume or release carbon dioxide in the process of photosynthesis. Photosynthesis and Respiration in Elodea Background Concepts: Plants can carry out both photosynthesis and respiration simultaneously. When water plants like Elodea are photosynthesizing, it … Photosynthesis is a process by which phototrophs convert light energy into chemical energy, which is later used to fuel cellular activities. Its leaves are thin and transparent; most leaves are only two cell layers thick. Elodea is a leafy flowering plant commonly found in aquariums. Egeria densa, also known as Elodea densa because of its previously incorrect classification in the Elodea genus, is the most popular aquatic plant used to teach photosynthesis in the classroom. Light Dark. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product. 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. Pour 25 mL of the bromothymol blue + water solution into each of the three test tubes. Plants do this by splitting water molecules and using electrons from hydrogen, leaving oxygen as waste product. Have at least 7-9 lab stations set up in the room with lamps. Demonstrate that environmental CO2 is used during photosynthesis in Elodea. O. Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. Add a 7 cm piece of Elodea to Tube 2. algae Elodea. Originally from Brazil, E. densa has spread to temperate regions on all of the continents except Antarctica. The chemical energy is stored in the form of sugars, which are created from water and carbon dioxide. Therefore in the presence of light, Elodeawill take up CO2, causing the concentration of CO2 in its surroundings to drop. Elodea 27.9 + 2.2 14.21 + 2.5 1.96 38.1 0.72 2.5 Spinacia 66.6 11.1 6.00 69.3 2.10 2.9 Zea 31.5 147.9 0.21 130.5 2.31 3.44 1Standard deviation. NARRATOR: The electrons lost from chlorophyll during photosynthesis have to be replaced. Photosynthesis of Elodea Inhibition Of Direct Light Affects Elodea 's Co2 Production During Photosynthesis. Students learn a simple technique for quantifying the amount of photosynthesis that occurs in a given period of time, using a common water plant (Elodea). Start studying Elodea and Photosynthesis Lab. Change the conditions of photosynthesis by altering light intensity and carbon dioxide amount, and determine the effects on the photosynthesis rate. To demonstrate that carbon dioxide is produced during respiration. 5. 2 Bio 2 Elodea Lab: Photosynthesis and Cellular Respiration Name_____per____ Objectives: to compare the reactions of photosynthesis and cellular respiration. The standard procedures such as counting oxygen bubbles generated by an elodea stem tend to not be “student” proof or reliable. In this practical students will be able to see photosynthesis and cellular respiration in action. During photosynthesis, plants are using the energy of the sun to build molecules which effectively store this energy (glucose). 1. on Photosynthesis of Elodea. One common way is to gather bubbles of gas given off by an aquatic plant. However, Cabomba is a more reliable plant and much more effective than the traditional Elodea. An experiment that uses aquatic plants shows a student that plants need light for the photosynthesis process. Students will have to utilize keen observation skills to count the number of bubbles that form in the different settings. Light's colour is determined by its wavelength of light, and thus it is possible to devise an experiment to determine which wavelengths of light are most productive for photosynthesis than others. Add 1-2 drops of bromothymol blue to 15mL of water in a 25 ml graduated cylinder. To observe the rate of photosynthesis under different light conditions. Teaching Topics. Elodea & Photosynthesis Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Tube 1 will be the control (no Elodea) Tube 2 will be the Elodea in the dark. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds. 3. Elodea plant, the chemical . Students will record their data which will be used to conclude whether carbon dioxide was consumed or released by the elodea. A. Elodea in AQUARIUM Water 1. Known for its bright green color and leafy stems, E. densais an excellent oxygenating plant, making it perfect for use in fresh… We did this by using a Gilson Respirometer and samples of Elodea plant placed in H2O and NaHCO 3 solutions—both of which were operated under lighte d and darkened external conditions—to measure the consumption of CO 2 during photosynthesis and the production of CO 2 during respiration. in photosynthesis per unit time is much greater than the amount generatedby respiration over the same time period (about 10-30 times greater.) 2) Crush the end of the stem at the site of incision gently. Through experiments, students determine that carbon dioxide, light, and chlorophyll are three of the necessary components of photosynthesis. 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