investigate the effect of carbon dioxide concentration on the rate of photosynthesis.
7/07/2004 Bilawal Ajmal Khan 10A H/W/K Science Investigation Aim: to investigate the effect of carbon dioxide concentration on the rate of photosynthesis. Scientific knowledge: The Elodea (Canadian pondweed) makes bubbles of oxygen when it photosynthesises. The faster it photosynthesises the faster it makes oxygen. The plant uses dissolved carbon dioxide. This can be made by adding hydrogen carbonate solution to the water. The factors which can effect how quickly a plant can make food by photosynthesis include the following. * Carbon dioxide concentration - this can be simulated by changing the volume of hydrogen carbonate solution added to the water. At low concentrations of carbon dioxide the rate of photosynthesis is very slow. As you increase the concentration of carbon dioxide the plant can make food faster and faster. There is a limit however. There comes a time when adding more carbon dioxide does not increase the rate of photosynthesis. The plant is making food as fast as it can under the conditions. * Light intensity - this can be altered by either changing the brightness of the bulb or by moving the bulb further and further away from the plant. Plants need light energy in order to make food. The more light they have the faster they can make food.
Biology CourseworkTo determine if the distribution of flora across Ellerbeck is due to chance. The valley containing Eller beck possesses a huge variety of different species of plant life, particular species are often found in specific places
Biology Coursework To determine if the distribution of flora across Ellerbeck is due to chance. The valley containing Eller beck possesses a huge variety of different species of plant life, particular species are often found in specific places across the valley, to find out why these particular plants grow in the particular places I mean to investigate where different species of plants are located and what the conditions in those particular places are, investigating the effects of several factors on the distribution of these different species across a specific area of the valley. I believe that the varied distribution of the different species investigated is directly related to, and can be explained by the differences in the factors I will be measuring, that certain plants will grow in certain places in the area because they are more suitably adapted, in whatever way to the conditions in that specific place. This is a rough diagram of Ellerbeck. I plan to perform my investigation using two information gathering techniques, after first establishing a straight line across the valley by taking a bearing using a compass from one point at the top of the South side of the valley and following that bearing down the valley, across the beck and up the other side whilst performing both a line transect and an interrupted belt transect. I also plan to perform an interrupted belt
An investigation into the effect of light intensity on the rate of photosynthesis of Canadian pondweed (Elodea canadensis)
An investigation into the effect of light intensity on the rate of photosynthesis of Canadian pondweed (Elodea canadensis) Planning Scientific knowledge and understanding All green plants need to be able to make their own food. They do this by a process called photosynthesis, which means, "making things with light." Photosynthesis is a series of organic chemical reactions by which green plants produce glucose and oxygen from carbon dioxide and water. It occurs only in the presence of light, and takes place in the chloroplasts of green plant cells. Land plants get carbon dioxide from the air. Water plants get carbon dioxide from water (carbon dioxide in the air dissolved into water). Photosynthesis creates oxygen and sugar. Oxygen is released into the air and used by all animals, including humans, in order to respire. Sugar is used by the plant to respire or store them inside their body. The overall chemical equation for photosynthesis can be expressed as: Plants convert the light energy into stored chemical energy. Photosynthesis is possible because green plants contain an energy-capturing substance called chlorophyll. The plant gets its green colour because chlorophyll is green. Light energy drives photosynthesis. The chlorophyll captures the light energy and uses it to build carbohydrates from simple raw materials (water, carbon dioxide and minerals). The raw
Use of a redox indicator to show dehydrogenase activity.
Use of a redox indicator to show dehydrogenase activity Introduction: Triphenyl tetrazolium chloride (TTC) is an example of an artificial hydrogen acceptor, or redox indicator. TTC is colourless when oxidised, but forms red, insoluble compounds called formazans when reduced. TTC can therefore be used to show the presence of active dehydrogenase enzymes by a colour change. This experiment investigates the effect of temperature on the activity of dehydrogenases in yeast cells. Materials: * Actively respiring yeast suspension. This should be prepared by adding 100g of dried yeast to 1dm3 of water and mixing in 50g glucose. This mixture should be allowed to stand in a large beaker for about 2 hours before the experiment. * Triphenyl tetrazolium chloride solution, 0.5% * Distilled water * Test tubes and rack * Graduated pipettes, or syringes * Glass rods * Crushed ice * Beakers or water baths * Thermometer * Stopwatch Method: . Set up water bath at 30?C. 2. Pipette 10cm3 of yeast suspension into one test tube and 1cm3 of TTC solution into another test tube and stand them both in the water bath. Leave for several minutes to reach the temperature of the water bath. 3. Mix the yeast suspension and TTC solution together and return the test tube to the water bath. Start the stopwatch immediately. 4. Observe carefully and note the time taken for any colour
Impact of Enzymes in Society
Eni Ballauri 9A January 31, 2007 Biology What is the impact of enzyme's use in human society 'Enzymes are special kinds of proteins that are found in all living matter. Living cells need enzymes to live and grow. Enzymes are catalysts, substances which speed up chemical reactions present in very small amounts without being changed in the reaction' [1] .It was firstly named enzyme by a German physiologist, Wilhelm Kühne in 1878. This term comes from Greek ????µ?? "in leaven" to describe the process. This word was later used to refer to nonliving substances, such as pepsin [2]. Enzymes are used for medical reasons [3], to treat a variety of illnesses, as well as to make various drinks and things to eat [4]. Enzymes can be found in everywhere, in the food we eat, such as cheese, yoghurt; in different drinks, such as wine [4]; in laundry detergents, and also in our body. The use of enzymes has begun years ago, since 1874, when the Danish chemist, Christian Hansen, made the first preparation of relatively high purity used for industrial purposes [5]. He produced the first specimen rennet by extracting dried calves' stomachs with saline solution [5]. People have been using enzymes unconsciously for ages in their food and drink, such as cheese, yoghurt, bread, beer, wine and others. In grapes, for instance, which are used to make wine, there is a natural form of fungus,
How the Mass of Plant Tissue is Affected by a Range of Water Concentrations
How the Mass of Plant Tissue is Affected by a Range of Water Concentrations I will make my investigation fair test by making sure that only the independent variable which is the water concentration changes. There are several control variables which I must ensure I keep the same: * Light * Temperature * Oxygen level in the water * Carbon dioxide level in the water * Size and type of chip I will make sure these remain the same throughout the experiment by: Light: I will carry out the experiment in the same place in the room. Temperature: I will carry out the experiment in the same position in the room. Oxygen level in the water and carbon dioxide level in the water: These are not likely to change much, but I will get the water from the same source. Size and type of chip: I will cut the chips all to the same size and get them from the same source. Prediction I predict that the lower the concentration of water that is in the test tube, the more mass the potato chip will lose. Reasons for Prediction I think that that the end mass will be higher when there is a higher concentration of water because the plant tissue will take in more water. Therefore the more water in the tissue the higher the mass will be. The plant tissue will absorb the water through a process called Osmosis. Osmosis is the movement of water molecules from an area of high concentration to an area
Investigation to find out how light intensity effects the rate of photosynthesis
Investigation to find out how light intensity effects the rate of photosynthesis Contents * Introduction * Aim * Hypothesis * Variables * Precaution * Fair Testing * Apparatus * Method * Diagram for Method * Results * Analysis of Results and Graphs * Conclusion * Evaluation * Errors, limitations and Improvements Introduction Flowering plants, like all living organisms, need a supply of food. They need it as a source of energy in respiration and they need it as raw material for growth and repair. Animals and most micro- organisms get their food in an organic form: they eat products from other organisms (such as fruit and eggs) or, nowadays, the organic substances made in laboratories and factories. Animals and the microorganisms that do this are called consumers. Due to the flowering plants can make their own organic food from simple inorganic substances and an outside source of energy, they are called producers. Once the producers have made their food they use it in the same way as the consumers do as a source of energy and as raw material for growth and repair Photosynthesis The simple inorganic substances from which flowering plants make their food are carbon dioxide (CO2) and water (H2O). These contain no energy that a flowering plant can use an outside source of energy is needed to combine them into a compound that the plant can use as food. The source
How the molar concentration of NaHCO3 (Sodium Hydrogen Carbonate) affects the rate of photosynthesis in Elodea.
How the molar concentration of NaHCO3 (Sodium Hydrogen Carbonate) affects the rate of photosynthesis in Elodea. In the experiment I am conducting, I will attempt to discover how the molar concentration of NaHCO3 affects the rate of photosynthesis in Elodea by setting up simple equipment, recording the results as well as attempting to draw some conclusions from my results. I will be looking to find if a relationship/correlation exists between the concentration of NaHCO3 and the amount of bubbles produced during a set duration. Factor chosen: I shall vary the molar concentration of NaHCO3 (Sodium Hydrogen Carbonate) in order to change the concentration of available CO2. My variables: In my experiment, my dependent variable will be the amount of oxygen produced, my independent variable will be the concentration of NaHCO3 and my control variable will be light intensity/distance of lamp from Elodea as well as temperature. Amount of oxygen produced: - the amount of oxygen produced will increase or decrease according to the strengths and amounts of the other factors. Oxygen is created as a result of photosynthesis along with glucose, and this oxygen will be present in the form of a bubble which I will attempt to count. Concentration of NaHCO3:- It gives out carbon dioxide, and when it is heated at relatively high temperatures, it gives out even more carbon dioxide. The
Biology investigation to investigate how selected variable affects the rate of fermentation in yeast.
Biology investigation to investigate how selected variable affects the rate of fermentation in yeast Planning I think that the easiest way to measure the rate of fermentation in yeast is to measure a waste product of respiration. When the yeast is unable to respire aerobically it respires anaerobically producing alcohol and carbon dioxide. I could measure either of these two things to measure the rate of reaction. To measure the volume carbon dioxide is easier. I will do this by counting the number of bubbles of carbon dioxide through a wine trap with water in it. This gives a good indication of how fast fermentation is occurring. I predict that as the temperature rises so will the rate of reaction in the yeast and therefore the volume of carbon dioxide produced. However when temperatures exceed 40°C the rate of reaction will start to decline and beyond 70°C the reaction will cease and if temperatures are significantly below 40°C (20°C) there will be very little or no reaction. I am of this opinion because of the way enzymes are affected by temperature and because yeast contains enzymes. I know that enzymes have an optimum working temperature of about 40°C and that below this they fail to work effectively and above it they become denatured and fail to work. After about 70°C all of the enzymes will have become denatured and none will work. There is just one variable
The Effect of Carbon Dioxide Concentration On The Rate of Photosynthesis.
Sophie Louise Beard The Effect of Carbon Dioxide Concentration On The Rate of Photosynthesis Aim To investigate the effect of carbon dioxide concentration on the rate of photosynthesis. Prediction I predict the higher the carbon dioxide concentration (sodium hydrogen carbonate solution concentration) the faster and higher the rate of photosynthesis will increase meaning more oxygen produced (more O bubbles given off) over a period of time [2 minutes]. The amount of carbon dioxide taken in I predict will be proportional to the amount of oxygen given out. E.g. 6CO +6H O --> C H O +6O As the amount of CO O I predict the graph will look something like this At the end of the graph, it will eventually level off and stop producing oxygen due to the limiting factors. Diagram Variables Things we could change which would effect our results are -: * Amount of light intensity * Amount of carbon dioxide(sodium hydrogen carbonate solution molar) * Different conditions (temperature) * Amount of pond weed We are going to change the sodium hydrogen carbonate solution concentration/molar to look at the effect the amount of carbon dioxide has on the rate of photosynthesis. Everything else will be kept the same. Safety Be careful when handling glass and allow the lamp to cool before packing it away or touching. Keep the area your working in clean and tidy; clean
