Light independent reactions take part in the stroma. Elodea produces bubbles when it breathes. 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). ... (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. 7 carbon dioxide concentration on the rate of photosynthesis. No. ... (waterthread pondweed) Vallisneria americana (tape grass or … - Pondweed- type of plant used in experiments. In fact, it does the opposite. What is Photosynthesis? The diagram shows the way the experiment was set up. 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.) Prediction 2. The more light energy the plant absorbs, the more gas it should produce. Oxygen. [2007] A student set up three test tubes A, B and C to study gas exchange in aquatic organisms. Carbon dioxide enters the leaf through tiny openings called the stomata. When in bloom, elodea produces white, three-petaled flowers that float on the surface of the water. Predict what the time is likely to be. In addition to the stomata, leaves maintain a boundary layer of air on their surface. 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). Factors. Glass microscope slides; Plastic cover slips; Paper towels or tissues; Salt solution (6 g salt dissolved in 100 ml of water or approx. 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. I predict that the bubbles of gas produced from Elodea plant will be oxygen gas. Alternative plants are likely to produce fewer and smaller gas bubbles and a … 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. Further, stomata help the leaves produce food for the plant via the process of photosynthesis. Repeat twice and calculate a mean bubble count – number of bubbles per minute. So then on nwe planet people will have the amount of oxygen needed to live. During the light reactions, an electron is stripped from a water molecule freeing the oxygen and hydrogen atoms. Photosynthesis is the process through which plants convert light energy from the sun to chemical energy. 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.. Count bubbles of oxygen gas given off by elodea to determine the rate of photosynthesis. 6CO2+6H2O>C6H12O6+6O2. Photosynthesis can be divided into two stages—the light dependent reaction and the light independent (or dark) reactions. Change the conditions of photosynthesis by altering light intensity and carbon dioxide amount, and determine the effects on the photosynthesis rate. - Funnel- to keep plant in place/together. Give a reason for your prediction. 2 teaspoons salt in a cup of water) Elodea; Water; See information on suppliers here. 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. [2 marks] 0 3 Describe how the student could change the method to investigate the effect of . 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. Materials used and results. - Water- this is to keep the pondweed alive. Method: - Set up equipment as shown above. When reacting with an acid or at temperatures above 200 degrees C, it FORMS carbon dioxide. Name the gas taken in. The elodea is an aquatic perennial plant. (ii) The bubbles of gas are only produced while photosynthesis is taking place. pondweed. Put the weed in a solution of NaHCO 3 solution. Carbon Dioxide – This gas enters through pores called stomata located on the underside of the leaf. 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 … For photosynthesis to happen for a light independent reaction, carbon dioxide needs to enter the plant. 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 As Elodea is a pond plant, the oxygen given off can be seen as bubbles. Elodea (pondweed) cells Materials. Each tube contained pond water and hydrogencarbonate indicator. - Light source- to reflect on to the pondweed. • counted the number of bubbles of gas released from the pondweed in 1 minute ... Why does the student put the maggots on gauze? Below is the list of factors that affect the rate of photosynthesis in plants: Light. These specialized apertures open during the day to allow for the exchange of … 4. Photosynthesis is the chemical change by which plants use carbon dioxide… In the presence of light pondweed undergoes photosynthesis and a gas is produced as one of the products. You can then investigate the amount of gas produced at different distances from a lamp. The more food produced the greater the amount of oxygen produced. pondweed of choice for this practical. Temperature. The water used is saturated with air, which is about 79% nitrogen gas and 21% oxygen gas. - Beaker- to store the pondweed and to do the experiment in. Observations- Over the course of 48 hours, the pondweed has produced enough oxygen to displace the water. Predict how many bubbles of gas would be produced in 1 minute if the pondweed was placed 40 cm from the light source. As the elodea produces oxygen in photosynthesis, some of the oxygen dissolves in the water and displaces nitrogen gas and carbon dioxide gas. During the day plants produce oxygen (O2) as a biproduct of photosynthesis, and CO2, as a biproduct of transpiration. 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. Fish and other aquatic animals depend on oxygen gas dissolved in water as much as people depend on oxygen gas in air. 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. It is not quite so easy to demonstrate the other reactions in photosynthesis. In garden ponds control is relatively easy, but in larger ponds and lakes it is more difficult. Solution A absorbs the gas released. The rate of photosynthesis in some pondweed was recorded by counting the bubbles produced per minute at equal intervals during the day. Historically there has been much confusion in the classification of the species of the genus Elodea (Family Hydrocharitaceae). The tubes were then left in bright sunlight for 12 hours. Methods ... Plants produce glucose by a process called photosynthesis. The diagram shows the experiment. 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