100cm, 80cm, 60cm, 40cm, 20cm) and the experiment repeated. Lab - Photosynthesis. Photosynthesis Experiment Pondweed Investigation of the rate of photosynthesis of pondweedResearch question: How does the concentration of sodium bicarbonate relate to the amount of oxygen produced by Elodea (Canadian pond weed) in the process of photosynthesis?Hypothesis: If there is an increase in concentration of sodium bicarbonate the amount of oxygen produced will increase … The animation below describes an experiment to investigate the effects of light on photosynthesis. Place the lamp (the only light source) at a fixed distance from the plant. For more detail on the set-up of this experiment, watch our high-quality required practical tutorial on YouTube. Photosynthesis is a chemical reaction that’s vital to most life on Earth. Hypothesis I think that if the light intensity is very low, then the number of bubbles of oxygen produced will also be very low, put a piece of pondweed into a test tube of water shone light from a lamp with a red light bulb onto the pondweed counted the bubbles of gas produced by the pondweed every minute for three minutes. Fill partly a wide-mouthed bottle with strong solution of caustic potash and fit a split cork on its mouth. Leave for five minutes for the pondweed to acclimatise to the new light intensity. First, conduct some research on abiotic factors that can affect the rate of photosynthesis in pondweed. Use a variety of sources of information e.g. The experiment is usually carried out with a common pond weed, and sighted students are instructed to count tiny bubbles: the faster the rate of bubble production, the faster the rate of photosynthesis. In this process, plants use the sun, carbon dioxide and water to create food energy. 1. Insert about half of the portion of a leaf of the de-starched plant into the bottle through the split cork (Fig. In this experiment, we were testing the rate of photosynthesis in elodea. There are 3 other potential variables you could test with this simulation: amount of carbon dioxide, light intensity, and temperature. This activity will allow students to measure the rate at which the photosynthesis process occurs. The pupils repeated their experiment using a blue light bulb, a green light bulb and a yellow light bulb. Basically, temperature does not pose an enormous effect on the rate of photosynthesis individually; it only affects the speed of the process by affecting the rhythm of … ctansil1. Photosynthesis By measuring the rate at which pond weed gives off oxygen bubbles with varying light intensity, It is possible to measure the rate at which photosynthesis is occurring. Photosynthesis required practical variables: Independent variable: Distance of the plant from the light source (light intensity) This traditional experiment on the rates of photosynthsesis in aquatic plants compares three common species. In experiments using eg Canadian pondweed, you can immerse the green weed in sodium hydrogencarbonate solution to supply the carbon dioxide (one variable) needed for photosynthesis. 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. In photosynthesis, plants use energy from the sun, water, and carbon dioxide (CO 2) from the air to store carbon and energy in the form of glucose molecules. However, Cook and Urmi-König (1985), in the latest revision of the genus, recognize five species of Elodea, all of them from the New World: E. potamogeton (Bert) Espinosa and E. callitrichoides (Rich.) Pondweed will photosynthesise in water - it is put in fish tanks to make sure there is enough oxygen for the fish. A water plant such as Elodea pond weed or Cabomba pond weed is placed upside in a test tube containing water. While performing the experiment, the piece of pondweed did not photosynthesize at a steady rate, even when the distance from the plant to the light source was kept a constant. Historically there has been much confusion in the classification of the species of the genus Elodea (Family Hydrocharitaceae). Canadian pondweed is used because it has an unusual quality of giving off bubbles of oxygen from a cut end and it’s easy to see and monitor / count the bubbles in water. itzel_celeste_lara. 20 terms. Originally from Brazil, E. densa has spread to temperate regions on all of the continents except Antarctica. The other two photosynthesis rate variables are temperature and light intensity. Practical - investigation of factors affecting photosynthesis. Count the number of bubbles given off in one minute. This activity is a lab where students design an experiment to test the rate of photosynthesis. If pondweed is not available I give them sample results or use an online virtual experiment. Aquatic plants are used for this experiment, usually Canadian pondweed. This process of making sugar and oxygen is called photosynthesis. It can be also be adapted easily for different abilities or for GCSE. Red light is more easily used by the pond weed than most other colours. Botany Exam #2 (Photosynthesis) 30 terms. Counting the bubbles helps determine the rate of photosynthesis. Mrs Peers-Dent shows you how to measure the rate of photosynthesis of pondweed. Known for its bright green color and leafy stems, E. densais an excellent oxygenating plant, making it perfect for use in fresh… In this experiment the rate of photosynthesis is measured by counting the number of bubbles rising from the cut end of a piece of Elodea or Cabomba. The word equation for photosynthesis is: Carbon Dioxide + Water = Glucose + Oxygen + Energy Pond-weed is being used fro this experiment because with a normal plant that does not live in water it would be a lot more difficult to Experiment. 3. Bio 110 Lab Practical 2 - Guide 2. Place a pond weed Elodea upside in a test tube containing water at 25°C. 36). 1. Biology Coursework: Photosynthesis The aim of the experiment was to investigate a factor that would affect the rate of photosynthesis in a Canadian pondweed plant. It is very difficult for us to obtain this plant in Kingdom. At any given point in this experiment, the number of floating leaf disks is an indirect measurement of the net rate of photosynthesis. The rate of photosynthesis should decrease and therefore the amount of oxygen bubbles should decrease. Bright light provides more energy than dim light. Experiments about photosynthesis … Oxygen bubbles are given off by the plant in response to photosynthesis. textbooks, websites and reviews. ctansil1. Introduction Photosynthesis is the process of using sunlight energy and chlorophyll to produce glucose from carbon dioxide and water.Photosynthesis occurs in the chloroplast. The affect of light on photosynthesis can be investigated using the experimental setup shown. Therefore you will conduct this practical on line. allisonmonie. Students will analyze data,write a report using the scientific method, and apply results to current environmental issues. morganwasham. For a plant to photosynthesize, it needs carbon dioxide and water and sunlight, a factor of photosynthesis. Pondweed (Elodea) Lab. The purpose of this experiment is to determine the effect of temperature on the photosynthesis of pondweed plant. 4.

Make sure to include information such as the color of light, light intensity,

We have also provided a PowerPoint presentation and notes on pondweed physiology. Animals depend on plants for food and to convert carbon dioxide into oxygen. MeGustaMuchos. It gets this from the light which shines on it. Obtain a … Place the tube in a beaker of fresh water. Setting Up the Experiment 1. If you look closely, you will see oxygen bubbles being produced from the cut end of the stem and this will tell you how quickly photosynthesis is happening. OTHER SETS BY THIS CREATOR. Place excess sodium bicarbonate (NaHCO3) in the water to give a constant saturated solution of CO2. Materials: Elodea sprigs Test tube and beaker Razor/scissors Water with Sodium Bicarbonate (baking soda) Light source (lamp) Ruler Procedure: PART A. Photosynthesis experiment... an example of a common experiment used to investigate light intensity and the rate of photosynthesis is the pond weed experiment. De-starch a potted plant by putting it in complete darkness for two days. Pondweed or Elodia is an aquatic plant typically used to measure the rate of photosynthesis. In this experiment, the light intensity is changed, by decreasing the light intensity. 38 terms. Notes on Taxonomy and Nomenclature Top of page. pond weed needs energy. 2. 55 terms. A worksheet made for a key stage three class about investigating photosynthesis using pondweed. Hazards Tripping Shocks Slipping Concussion Elodea Results My results prove my original hypothesis to be correct When the distance from the light source and the pondweed increased the rate of oxygen production decreases, therefore the more higher the light intensity the greater Quiz 6 Econ 400. Rates of photosynthesis can be slower in water, however, as the levels carbon dioxide dissolved in the water can be variable. It is easily available from aquarium shops and science suppliers. 16 terms. Experiment Ideas for Photosynthesis. In order for us to measure the rate of photosynthesis, we needed to … Quiz 7 Econ 400. This pondweed is widely recommended for photosynthesis experiments, as it can be used for demonstrating oxygen formation during photosynthesis. Pond weed uses the carbon dioxide which is dissolved in the water it is in. 20 terms. Set up the apparatus as in the diagram. Maintain the room temperature at 20°C. The distance is then varied (e.g. Photosynthesis in Ponds Plants in water need to photosynthesise just like those on land. The worksheet includes a diagram, method, results table, questions and a quiz. Lab Test. Photosynthesis is a simulation of the classic pondweed experiment. The second reading at 8 cm was far greater than the first reading at 8 cm. Oxygen gas (O 2) is a byproduct of this reaction. (This information can be used later to write a short introduction to your experiment). Objective: To measure the rate of photosynthesis at varying light intensities. 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pondweed photosynthesis experiment

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