As plants produce food by photosynthesis they also give out oxygen. Alternative plants are likely to produce fewer and smaller gas bubbles and a … Factors. Elodea produces bubbles when it breathes. No. Glass microscope slides; Plastic cover slips; Paper towels or tissues; Salt solution (6 g salt dissolved in 100 ml of water or approx. During the day plants produce oxygen (O2) as a biproduct of photosynthesis, and CO2, as a biproduct of transpiration. The more light energy the plant absorbs, the more gas it should produce. Name the gas produced. The water used is saturated with air, which is about 79% nitrogen gas and 21% oxygen gas. - Water- this is to keep the pondweed alive. Light independent reactions take part in the stroma. Method: - Set up equipment as shown above. The diagram shows the experiment. It is not quite so easy to demonstrate the other reactions in photosynthesis. Historically there has been much confusion in the classification of the species of the genus Elodea (Family Hydrocharitaceae). Count bubbles of oxygen gas given off by elodea to determine the rate of photosynthesis. Elodea (pondweed) cells Materials. 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. 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.) The free oxygen atom combines with another free oxygen atom to produce oxygen gas which is then released. In the presence of light pondweed undergoes photosynthesis and a gas is produced as one of the products. During the light reactions, an electron is stripped from a water molecule freeing the oxygen and hydrogen atoms. They use this technique to compare the amounts of photosynthesis that occur under conditions of low and high light levels. In fact, it does the opposite. The rate of photosynthesis in some pondweed was recorded by counting the bubbles produced per minute at equal intervals during the day. The elodea is an aquatic perennial plant. In addition to the stomata, leaves maintain a boundary layer of air on their surface. Predict what the time is likely to be. Background: In this experiment, the relationship between the photosynthesis rate and temperature on Elodea is investigated. Materials used and results. [2007] Pondweed and all green plants take in and use another gas, from their environment during photosynthesis. Photosynthesis is the process through which plants convert light energy from the sun to chemical energy. ... some produce more than others. Learn term:oxygen+and+sugars = the products of photosynthesis with free interactive flashcards. State two variables the student needed to control in this investigation. Solution A absorbs the gas released. When reacting with an acid or at temperatures above 200 degrees C, it FORMS carbon dioxide. Further, stomata help the leaves produce food for the plant via the process of photosynthesis. The function of the sodium bicarbonate in this experiment, was providing carbon dioxide for photosynthesis to occur. What does the rate of the production of oxygen (measured in bubble count) indicate? 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. However, respiration continues in the dark, so the disks will use the accumulated O 2 gas. Below is the list of factors that affect the rate of photosynthesis in plants: Light. Carbon dioxide enters the leaf through tiny openings called the stomata. 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.. By Staff Writer Last Updated Apr 5, 2020 11:20:57 PM ET. ... (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. You should include: • counted the number of bubbles of gas released from the pondweed in 1 minute ... Why does the student put the maggots on gauze? (ii) The bubbles of gas are only produced while photosynthesis is taking place. How Does Carbon Dioxide Enter the Leaf? The student placed two water snails in tube A, some pondweed in tube B and two water snails and some pondweed in tubeC. _____ _____ (1) (b) When maggots respire they take in a gas from the air and release a different gas. Carbon Dioxide – This gas enters through pores called stomata located on the underside of the leaf. 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). [2007] What is Photosynthesis? For photosynthesis to happen for a light independent reaction, carbon dioxide needs to enter the plant. I predict that the bubbles of gas produced from Elodea plant will be oxygen gas. When in bloom, elodea produces white, three-petaled flowers that float on the surface of the water. ... (waterthread pondweed) Vallisneria americana (tape grass or … Repeat twice and calculate a mean bubble count – number of bubbles per minute. The tubes were then left in bright sunlight for 12 hours. 2 teaspoons salt in a cup of water) Elodea; Water; See information on suppliers here. Name the gas taken in. So then on nwe planet people will have the amount of oxygen needed to live. 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. 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 chemical energy is then stored as sugar. 6CO2+6H2O>C6H12O6+6O2. The more food produced the greater the amount of oxygen produced. 7 carbon dioxide concentration on the rate of photosynthesis. (i) The student needed to control some variables to make the investigation fair. The water also contains an unnaturally high amount of carbon dioxide because of the sodium bicarbonate added. The diagram shows the way the experiment was set up. Oxygen. d Change one factor that may affect the rate of photosynthesis, keeping all other factors … Give a reason for your prediction. ... Plants produce glucose by a process called photosynthesis. [2 marks] 0 3 Describe how the student could change the method to investigate the effect of . 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. 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 This trait makes the elodea a useful tool in the study of plant structures and plants' ability to produce energy. We investigated in which temperature plants will produce the biggest amount of oxygen. What is the equation for photosynthesis? Elodea (Canadian Pondweed) is often used to investigate the speed of photosynthesis under differnet conditions. - Light source- to reflect on to the pondweed. The rate of photosynthesis. •€€€€€€€€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. pondweed. 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. Absolutely not. Observations- Over the course of 48 hours, the pondweed has produced enough oxygen to displace the water. Photosynthesis is the chemical change by which plants use carbon dioxide… Predict how many bubbles of gas would be produced in 1 minute if the pondweed was placed 40 cm from the light source. 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). This is the mean rate of bubble production. I predict that the Elodea will produce more oxygen bubbles when the light is closer to it. Pondweed is a green plant that lives in water. In the aquatic environment, a number of aquatic plant species have oxygenating capabilities. As the elodea produces oxygen in photosynthesis, some of the oxygen dissolves in the water and displaces nitrogen gas and carbon dioxide gas. In garden ponds control is relatively easy, but in larger ponds and lakes it is more difficult. 5. Fish and other aquatic animals depend on oxygen gas dissolved in water as much as people depend on oxygen gas in air. - Hold the funnel in place. 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. These specialized apertures open during the day to allow for the exchange of … The process of photosynthesis has produced enough oxygen to produce a bubble. 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