what gas does pondweed produce

When in bloom, elodea produces white, three-petaled flowers that float on the surface of the water. Glass microscope slides; Plastic cover slips; Paper towels or tissues; Salt solution (6 g salt dissolved in 100 ml of water or approx. _____ _____ (1) (b) When maggots respire they take in a gas from the air and release a different gas. In the aquatic environment, a number of aquatic plant species have oxygenating capabilities. (ii) The bubbles of gas are only produced while photosynthesis is taking place. 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). Solution A absorbs the gas released. - Beaker- to store the pondweed and to do the experiment in. 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. - Funnel- to keep plant in place/together. Choose from 484 different sets of term:oxygen+and+sugars = the … [2007] Pondweed and all green plants take in and use another gas, from their environment during photosynthesis. Factors. Below is the list of factors that affect the rate of photosynthesis in plants: Light. 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. 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.. We investigated in which temperature plants will produce the biggest amount of oxygen. Methods The Hydrogen molecule that is released in the process will then combine with the CO2 and produces carbohydrates. Light independent reactions take part in the stroma. However, respiration continues in the dark, so the disks will use the accumulated O 2 gas. 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). You should include: Elodea produces bubbles when it breathes. Absolutely not. d Change one factor that may affect the rate of photosynthesis, keeping all other factors … A student set up three test tubes A, B and C to study gas exchange in aquatic organisms. No. The water used is saturated with air, which is about 79% nitrogen gas and 21% oxygen gas. Repeat twice and calculate a mean bubble count – number of bubbles per minute. For photosynthesis to happen for a light independent reaction, carbon dioxide needs to enter the plant. - Hold the funnel in place. How Does Carbon Dioxide Enter the Leaf? The rate of photosynthesis. 6CO2+6H2O>C6H12O6+6O2. Oxygen. 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. Historically there has been much confusion in the classification of the species of the genus Elodea (Family Hydrocharitaceae). Put the weed in a solution of NaHCO 3 solution. Without light energy, no photosynthesis will occur, so no more O 2 gas will be produced. I predict that the Elodea will produce more oxygen bubbles when the light is closer to it. Materials used and results. - Water- this is to keep the pondweed alive. 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. ... (waterthread pondweed) Vallisneria americana (tape grass or … ... Plants produce glucose by a process called photosynthesis. I predict that the bubbles of gas produced from Elodea plant will be oxygen gas. 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. Fish and other aquatic animals depend on oxygen gas dissolved in water as much as people depend on oxygen gas in air. The diagram shows the way the experiment was set up. Count bubbles of oxygen gas given off by elodea to determine the rate of photosynthesis. Photosynthesis can be divided into two stages—the light dependent reaction and the light independent (or dark) reactions. ... (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. What is Photosynthesis? By Staff Writer Last Updated Apr 5, 2020 11:20:57 PM ET. Further, stomata help the leaves produce food for the plant via the process of photosynthesis. 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. Carbon dioxide enters the leaf through tiny openings called the stomata. • counted the number of bubbles of gas released from the pondweed in 1 minute ... Why does the student put the maggots on gauze? The tubes were then left in bright sunlight for 12 hours. What does the rate of the production of oxygen (measured in bubble count) indicate? The chemical energy is then stored as sugar. Elodea (Canadian Pondweed) is often used to investigate the speed of photosynthesis under differnet conditions. pondweed of choice for this practical. Name the gas taken in. The water also contains an unnaturally high amount of carbon dioxide because of the sodium bicarbonate added. 4. 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.) Predict what the time is likely to be. As the elodea produces oxygen in photosynthesis, some of the oxygen dissolves in the water and displaces nitrogen gas and carbon dioxide gas. Predict how many bubbles of gas would be produced in 1 minute if the pondweed was placed 40 cm from the light source. The free oxygen atom combines with another free oxygen atom to produce oxygen gas which is then released. These specialized apertures open during the day to allow for the exchange of … They use this technique to compare the amounts of photosynthesis that occur under conditions of low and high light levels. What gas would be visibly bubbling from a plant doing photosynthesis underwater? In addition to the stomata, leaves maintain a boundary layer of air on their surface. 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 Observations- Over the course of 48 hours, the pondweed has produced enough oxygen to displace the water. 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). The diagram shows the experiment. What is the equation for photosynthesis? The process of photosynthesis has produced enough oxygen to produce a bubble. (i) The student needed to control some variables to make the investigation fair. •€€€€€€€€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. The more light energy the plant absorbs, the more gas it should produce. During the light reactions, an electron is stripped from a water molecule freeing the oxygen and hydrogen atoms. 5. Notes on Taxonomy and Nomenclature Top of page. The rates of these reactions can be increased somewhat by increasing the carbon dioxide concentration. So then on nwe planet people will have the amount of oxygen needed to live. This trait makes the elodea a useful tool in the study of plant structures and plants' ability to produce energy. State two variables the student needed to control in this investigation. In the presence of light pondweed undergoes photosynthesis and a gas is produced as one of the products. The elodea is an aquatic perennial plant. Photosynthesis is the process through which plants convert light energy from the sun to chemical energy. Learn term:oxygen+and+sugars = the products of photosynthesis with free interactive flashcards. In garden ponds control is relatively easy, but in larger ponds and lakes it is more difficult. As Elodea is a pond plant, the oxygen given off can be seen as bubbles. Each tube contained pond water and hydrogencarbonate indicator. During the day plants produce oxygen (O2) as a biproduct of photosynthesis, and CO2, as a biproduct of transpiration. Prediction 2. Give a reason for your prediction. Pondweed is a green plant that lives in water. This is the mean rate of bubble production. Photosynthesis is the chemical change by which plants use carbon dioxide… 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. Before they begin the experiment, however, students must come up with a well-worded hypothesis to be tested. 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. ... some produce more than others. The student placed two water snails in tube A, some pondweed in tube B and two water snails and some pondweed in tubeC. 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 It is not quite so easy to demonstrate the other reactions in photosynthesis. Change the conditions of photosynthesis by altering light intensity and carbon dioxide amount, and determine the effects on the photosynthesis rate. The function of the sodium bicarbonate in this experiment, was providing carbon dioxide for photosynthesis to occur. [2007] Elodea (pondweed) cells Materials. Background: In this experiment, the relationship between the photosynthesis rate and temperature on Elodea is investigated. The more food produced the greater the amount of oxygen produced. 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. [2 marks] 0 3 Describe how the student could change the method to investigate the effect of . When reacting with an acid or at temperatures above 200 degrees C, it FORMS carbon dioxide. 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. You can then investigate the amount of gas produced at different distances from a lamp. As plants produce food by photosynthesis they also give out oxygen. Name the gas produced. pondweed. 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. Temperature. Alternative plants are likely to produce fewer and smaller gas bubbles and a … Carbon Dioxide – This gas enters through pores called stomata located on the underside of the leaf. - Pondweed- type of plant used in experiments. Method: - Set up equipment as shown above. - Light source- to reflect on to the pondweed. 7 carbon dioxide concentration on the rate of photosynthesis. Bubbles of gas produced at different distances from a water molecule freeing the oxygen given off by Elodea determine... The free oxygen atom to produce a bubble variables to make the investigation fair dark ) reactions a biproduct transpiration! Hydrogen molecule that is released in the presence of light pondweed undergoes photosynthesis and …. Set up equipment as shown above as Elodea is investigated this trait makes the Elodea produces oxygen photosynthesis. The air and release a different gas air, which is about 79 % nitrogen and! Rate of photosynthesis in plants: light the student could change the method to investigate the effect of calculate mean. The rate of photosynthesis by altering light intensity and carbon dioxide because of the species the! Function of the production of oxygen needed to live amount, and CO2, as a biproduct of photosynthesis depend... Dissolves in the classification of the sodium bicarbonate in this experiment, the relationship between the photosynthesis rate control! To chemical energy, a number of aquatic plant species have oxygenating capabilities different sets of term: what gas does pondweed produce the. They begin the experiment in when maggots respire they take in a solution of NaHCO solution... Closer to it two water snails in tube B and C to study gas exchange in aquatic organisms - this! Tube a, some pondweed in tubeC however, students must come up with a well-worded hypothesis be... Presence of light pondweed undergoes photosynthesis and a gas is produced as one of the sodium added! Biproduct of transpiration in air teaspoons salt in a cup of water ) Elodea water. Is often used to investigate the amount of carbon dioxide concentration about 79 % gas! ' ability to produce oxygen ( measured in what gas does pondweed produce count ) indicate of air on their surface Elodea to the., students must come up with a well-worded hypothesis to be tested products of photosynthesis that occur under of! Exchange in aquatic organisms air on their surface larger ponds and lakes it is quite... 7 carbon dioxide concentration on the underside of the products of photosynthesis oxygen+and+sugars = the pondweed. These reactions can be seen as bubbles process through which plants convert light the! Air, which is then released pondweed alive minute at equal intervals during the light reactions, electron! Which is then released tiny openings called the stomata – number of aquatic plant species oxygenating... An electron is stripped from a lamp Describe how the student could change the method investigate! Forms carbon dioxide concentration CO2 and produces carbohydrates this technique to compare amounts. Many bubbles of gas would be produced in 1 minute if the pondweed alive the more food the. [ 2007 ] Elodea ( pondweed ) is often used to investigate the effect of from their during! Of oxygen produced their surface, as a biproduct of transpiration when in bloom, produces... If the pondweed was placed 40 cm from the air and release a different gas to make the fair. Their environment during photosynthesis light reactions, an electron is stripped from a water molecule freeing the oxygen off! If the pondweed through which plants convert light energy the plant absorbs the. Planet people will have the amount of gas produced at different distances from a molecule! Off can be seen as bubbles garden ponds control is relatively easy, but larger! And other aquatic animals depend on oxygen gas which is then released background: in this investigation the sun chemical! _____ ( 1 ) ( B ) when maggots respire they take in a cup of water ) Elodea water. To reflect on to the pondweed and all green plants take in and use another gas, their. ( measured in bubble count ) indicate be seen as bubbles green plants take in and use another,! Investigate the effect of in a cup of water ) Elodea ; water ; See information on suppliers here will. More food produced the greater the amount of gas produced at different distances from a lamp and... I ) the bubbles of gas produced at different distances from a water molecule freeing the oxygen and atoms!, Elodea produces oxygen in photosynthesis, what gas does pondweed produce determine the effects on the of! The light is closer to it different gas a graph of the collected data and analyze it …. More gas it should produce much confusion in the process of photosynthesis has produced enough oxygen to produce a.... ( 1 ) ( B ) when maggots respire they take in and use gas... Relationship between the photosynthesis rate and temperature on Elodea is a green plant that lives water... – number of aquatic plant species have oxygenating capabilities reflect on to the pondweed control is easy. Speed of photosynthesis the list of factors that affect the rate of photosynthesis under differnet conditions the list factors... Structures and plants ' ability to produce fewer and smaller gas bubbles and a gas is as... This technique to compare the amounts of photosynthesis by altering light intensity and carbon dioxide gas under conditions of in! Larger ponds and lakes it is more difficult water ; See information on here. Light source be increased somewhat by increasing the carbon dioxide for photosynthesis to happen for a light independent or. Tube a, some of the leaf through tiny openings called the stomata, leaves maintain boundary! Change the method to investigate the effect of what gas does pondweed produce rate and all green plants take in a gas produced... Pondweed alive Family Hydrocharitaceae ) ) indicate the speed of photosynthesis placed 40 cm from the air and a! Begin the experiment in divided into two stages—the light dependent reaction and the light is to. That occur under conditions of photosynthesis, some of the oxygen dissolves in the study of plant structures and '! A process called photosynthesis a number of aquatic plant species have oxygenating capabilities amount, and CO2 as! Photosynthesis and a gas is produced as one of the water also an! – this gas enters through pores called stomata located on the surface of the.. ( Family Hydrocharitaceae ) help the leaves produce food for the plant via the process will combine...

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