During the light reactions, an electron is stripped from a water molecule freeing the oxygen and hydrogen atoms. Carbon Dioxide – This gas enters through pores called stomata located on the underside of the leaf. - Light source- to reflect on to the pondweed. I predict that the Elodea will produce more oxygen bubbles when the light is closer to it. a Set up the apparatus as shown in a darkened room.. b Look for a stream of bubbles coming from the cut end of the pondweed.. c Count the number of bubbles produced in 1 minute. Predict how many bubbles of gas would be produced in 1 minute if the pondweed was placed 40 cm from the light source. The Hydrogen molecule that is released in the process will then combine with the CO2 and produces carbohydrates. If a light source is placed near the pondweed plant that acts as sunlight, then the plant will release more oxygen due to splitting of water molecule into hydrogen and Oxygen molecule. The tubes were then left in bright sunlight for 12 hours. ... Plants produce glucose by a process called photosynthesis. Change the conditions of photosynthesis by altering light intensity and carbon dioxide amount, and determine the effects on the photosynthesis rate. Repeat twice and calculate a mean bubble count – number of bubbles per minute. Oxygen. Name the gas produced. No. ... (also called pondweed and available at pet stores) Glass jar or beaker; Funnel that fits inside the jar; ... the pure oxygen in the test tube causes it to glow brighter or produce a flame. Absolutely not. 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). What gas would be visibly bubbling from a plant doing photosynthesis underwater? Method: - Set up equipment as shown above. Photosynthesis is the chemical change by which plants use carbon dioxide… During the day plants produce oxygen (O2) as a biproduct of photosynthesis, and CO2, as a biproduct of transpiration. - Beaker- to store the pondweed and to do the experiment in. Prepare a graph of the collected data and analyze it. 6CO2+6H2O>C6H12O6+6O2. Learn term:oxygen+and+sugars = the products of photosynthesis with free interactive flashcards. They use this technique to compare the amounts of photosynthesis that occur under conditions of low and high light levels. CLEAPSS have advised that it will shortly be impossible for schools to buy Cabomba and Elodea (although you can still use them if they are in your school pond/aquarium tank). Photosynthesis is the process through which plants convert light energy from the sun to chemical energy. Factors. pondweed. A few minutes after placing the plant into the funnel and beaker, the pondweed released a bubble, showing the release of oxygen by the plant. Further, stomata help the leaves produce food for the plant via the process of photosynthesis. - Water- this is to keep the pondweed alive. Using what you know about the electromagnetic spectrum and chlorophyll, predict the flask that will have the plant with the highest gas production and write “1” in the “Prediction” column of Table 2.8. Each tube contained pond water and hydrogencarbonate indicator. Prediction 2. Photosynthesis - Photosynthesis - Carbon dioxide: Included among the rate-limiting steps of the dark stage of photosynthesis are the chemical reactions by which organic compounds are formed by using carbon dioxide as a carbon source. In garden ponds control is relatively easy, but in larger ponds and lakes it is more difficult. This trait makes the elodea a useful tool in the study of plant structures and plants' ability to produce energy. (ii) The bubbles of gas are only produced while photosynthesis is taking place. By Staff Writer Last Updated Apr 5, 2020 11:20:57 PM ET. 4. To do this, place Cabomba pondweed in an upside down syringe in a water bath connected to a capillary tube (you can also use Elodea, but we find Cabomba more reliable). of bubble per minute Time of day -----0-----06.00 -----10-----12.00 -----20-----18.00 -----0-----x a) The time for the final reading is missing. It is not quite so easy to demonstrate the other reactions in photosynthesis. Count bubbles of oxygen gas given off by elodea to determine the rate of photosynthesis. - Pondweed- type of plant used in experiments. We investigated in which temperature plants will produce the biggest amount of oxygen. Glass microscope slides; Plastic cover slips; Paper towels or tissues; Salt solution (6 g salt dissolved in 100 ml of water or approx. What is Photosynthesis? Notes on Taxonomy and Nomenclature Top of page. When in bloom, elodea produces white, three-petaled flowers that float on the surface of the water. The rate of photosynthesis in some pondweed was recorded by counting the bubbles produced per minute at equal intervals during the day. The more food produced the greater the amount of oxygen produced. As Elodea is a pond plant, the oxygen given off can be seen as bubbles. (i) The student needed to control some variables to make the investigation fair. Background: In this experiment, the relationship between the photosynthesis rate and temperature on Elodea is investigated. - Hold the funnel in place. Before they begin the experiment, however, students must come up with a well-worded hypothesis to be tested. Give a reason for your prediction. A student set up three test tubes A, B and C to study gas exchange in aquatic organisms. The water used is saturated with air, which is about 79% nitrogen gas and 21% oxygen gas. When reacting with an acid or at temperatures above 200 degrees C, it FORMS carbon dioxide. Solution A absorbs the gas released. Pondweed is a green plant that lives in water. In the aquatic environment, a number of aquatic plant species have oxygenating capabilities. 7 carbon dioxide concentration on the rate of photosynthesis. ... some produce more than others. The increases in bubbling (gas production) as the light source is moved closer to the plants indicate that the rate of oxygen production by the photosynthesis is affected by the intensity of the light source. The water also contains an unnaturally high amount of carbon dioxide because of the sodium bicarbonate added. I predict that the bubbles of gas produced from Elodea plant will be oxygen gas. You should include: During the process of photosynthesis, plants capture light energy and use it to convert water, carbon dioxide, and minerals into oxygen (released into the air) and glucose (stored in Elodea (pondweed) cells Materials. The free oxygen atom combines with another free oxygen atom to produce oxygen gas which is then released. [2 marks] 0 3 Describe how the student could change the method to investigate the effect of . Photosynthesis can be divided into two stages—the light dependent reaction and the light independent (or dark) reactions. As plants produce food by photosynthesis they also give out oxygen. [2007] pondweed of choice for this practical. Methods Predict what the time is likely to be. It is fairly easy to show that plants produce oxygen and starch in photosynthesis.At age 14–16 students may have collected the gas given off by pond weed (for example Elodea) and tested leaves for starch.. Without light energy, no photosynthesis will occur, so no more O 2 gas will be produced. [2007] Pondweed and all green plants take in and use another gas, from their environment during photosynthesis. The student placed two water snails in tube A, some pondweed in tube B and two water snails and some pondweed in tubeC. Observations- Over the course of 48 hours, the pondweed has produced enough oxygen to displace the water. Elodea (Canadian Pondweed) is often used to investigate the speed of photosynthesis under differnet conditions. For photosynthesis to happen for a light independent reaction, carbon dioxide needs to enter the plant. How Does Carbon Dioxide Enter the Leaf? In the presence of light pondweed undergoes photosynthesis and a gas is produced as one of the products. Below is the list of factors that affect the rate of photosynthesis in plants: Light. The diagram shows the way the experiment was set up. Materials used and results. The process of photosynthesis has produced enough oxygen to produce a bubble. The more light energy the plant absorbs, the more gas it should produce. What does the rate of the production of oxygen (measured in bubble count) indicate? 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 The chemical energy is then stored as sugar. Put the weed in a solution of NaHCO 3 solution. • counted the number of bubbles of gas released from the pondweed in 1 minute ... Why does the student put the maggots on gauze? Carbon dioxide enters the leaf through tiny openings called the stomata. 2 teaspoons salt in a cup of water) Elodea; Water; See information on suppliers here. State two variables the student needed to control in this investigation. 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.) 5. The fact that no gas was produced while the setup was kept in the dark showed that light was the cause of the production of oxygen. So then on nwe planet people will have the amount of oxygen needed to live. However, respiration continues in the dark, so the disks will use the accumulated O 2 gas. What is the equation for photosynthesis? The elodea is an aquatic perennial plant. This is the mean rate of bubble production. Choose from 484 different sets of term:oxygen+and+sugars = the … Name the gas taken in. In fact, it does the opposite. Temperature. _____ _____ (1) (b) When maggots respire they take in a gas from the air and release a different gas. •€€€€€€€€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. In addition to the stomata, leaves maintain a boundary layer of air on their surface. The function of the sodium bicarbonate in this experiment, was providing carbon dioxide for photosynthesis to occur. d Change one factor that may affect the rate of photosynthesis, keeping all other factors … Alternative plants are likely to produce fewer and smaller gas bubbles and a … The diagram shows the experiment. You can then investigate the amount of gas produced at different distances from a lamp. Fish and other aquatic animals depend on oxygen gas dissolved in water as much as people depend on oxygen gas in air. - Funnel- to keep plant in place/together. Light independent reactions take part in the stroma. ... (waterthread pondweed) Vallisneria americana (tape grass or … Historically there has been much confusion in the classification of the species of the genus Elodea (Family Hydrocharitaceae). Elodea produces bubbles when it breathes. The rates of these reactions can be increased somewhat by increasing the carbon dioxide concentration. 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