Photosynthesis can be divided into two stages—the light dependent reaction and the light independent (or dark) reactions. ... Plants produce glucose by a process called photosynthesis. The more food produced the greater the amount of oxygen produced. 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). When in bloom, elodea produces white, three-petaled flowers that float on the surface of the water. Repeat twice and calculate a mean bubble count – number of bubbles per minute. 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. ... (waterthread pondweed) Vallisneria americana (tape grass or … Solution A absorbs the gas released. - Beaker- to store the pondweed and to do the experiment in. In garden ponds control is relatively easy, but in larger ponds and lakes it is more difficult. • counted the number of bubbles of gas released from the pondweed in 1 minute ... Why does the student put the maggots on gauze? 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. - Light source- to reflect on to the pondweed. The function of the sodium bicarbonate in this experiment, was providing carbon dioxide for photosynthesis to occur. [2007] Pondweed and all green plants take in and use another gas, from their environment during photosynthesis. In the aquatic environment, a number of aquatic plant species have oxygenating capabilities. Elodea produces bubbles when it breathes. How Does Carbon Dioxide Enter the Leaf? In addition to the stomata, leaves maintain a boundary layer of air on their surface. When reacting with an acid or at temperatures above 200 degrees C, it FORMS carbon dioxide. We investigated in which temperature plants will produce the biggest amount of oxygen. Name the gas taken in. Learn term:oxygen+and+sugars = the products of photosynthesis with free interactive flashcards. Put the weed in a solution of NaHCO 3 solution. Predict what the time is likely to be. During the day plants produce oxygen (O2) as a biproduct of photosynthesis, and CO2, as a biproduct of transpiration. During the light reactions, an electron is stripped from a water molecule freeing the oxygen and hydrogen atoms. 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. For photosynthesis to happen for a light independent reaction, carbon dioxide needs to enter the plant. Further, stomata help the leaves produce food for the plant via the process of photosynthesis. 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. 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). As plants produce food by photosynthesis they also give out oxygen. Prediction 2. Light independent reactions take part in the stroma. [2 marks] 0 3 Describe how the student could change the method to investigate the effect of . Without light energy, no photosynthesis will occur, so no more O 2 gas will be produced. It is not quite so easy to demonstrate the other reactions in photosynthesis. State two variables the student needed to control in this investigation. The process of photosynthesis has produced enough oxygen to produce a bubble. Before they begin the experiment, however, students must come up with a well-worded hypothesis to be tested. The water used is saturated with air, which is about 79% nitrogen gas and 21% oxygen gas. The rates of these reactions can be increased somewhat by increasing the carbon dioxide concentration. [2007] 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 The tubes were then left in bright sunlight for 12 hours. The student placed two water snails in tube A, some pondweed in tube B and two water snails and some pondweed in tubeC. Change the conditions of photosynthesis by altering light intensity and carbon dioxide amount, and determine the effects on the photosynthesis rate. - Pondweed- type of plant used in experiments. Materials used and results. Count bubbles of oxygen gas given off by elodea to determine the rate of photosynthesis. Aquatic weeds (or pond weeds) can normally be tolerated in small numbers, but it is when they make excessive growth that they become a nuisance, particularly in summer. Temperature. Absolutely not. The Hydrogen molecule that is released in the process will then combine with the CO2 and produces carbohydrates. As Elodea is a pond plant, the oxygen given off can be seen as bubbles. Factors. You can then investigate the amount of gas produced at different distances from a lamp. - Water- this is to keep the pondweed alive. 2 teaspoons salt in a cup of water) Elodea; Water; See information on suppliers here. Prepare a graph of the collected data and analyze it. Background: In this experiment, the relationship between the photosynthesis rate and temperature on Elodea is investigated. They use this technique to compare the amounts of photosynthesis that occur under conditions of low and high light levels. 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.) Below is the list of factors that affect the rate of photosynthesis in plants: Light. - Funnel- to keep plant in place/together. The more light energy the plant absorbs, the more gas it should produce. 7 carbon dioxide concentration on the rate of photosynthesis. 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. Pondweed is a green plant that lives in water. 5. In fact, it does the opposite. ... (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. 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.. Alternative plants are likely to produce fewer and smaller gas bubbles and a … Give a reason for your prediction. 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. Historically there has been much confusion in the classification of the species of the genus Elodea (Family Hydrocharitaceae). As the elodea produces oxygen in photosynthesis, some of the oxygen dissolves in the water and displaces nitrogen gas and carbon dioxide gas. 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 Choose from 484 different sets of term:oxygen+and+sugars = the … The elodea is an aquatic perennial plant. You should include: I predict that the bubbles of gas produced from Elodea plant will be oxygen gas. Carbon dioxide enters the leaf through tiny openings called the stomata. The free oxygen atom combines with another free oxygen atom to produce oxygen gas which is then released. Elodea (pondweed) cells Materials. This trait makes the elodea a useful tool in the study of plant structures and plants' ability to produce energy. 4. 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