Photosynthesis And Factors Affecting It.
Biology Coursework: Photosynthesis And Factors Affecting It Niall O'Connor Introduction: Green plants make their own food by the process of Photosynthesis. Four things are needed for photosynthesis to occur in the cells of green plants, light from the Sun, carbon dioxide which diffuses from the air, water from the soil and chlorophyll from the leaves of the plant. Photosynthesis produces glucose, which is used for biomass and energy and oxygen, which is released into the atmosphere. The Word & Symbol Equation For Photosynthesis: Carbon Dioxide + Water Glucose + Oxygen 6CO2 + 6H20 C6H12O6 + 6O2 Scientific Knowledge: Effect of Temperature: (Graph from Lonsdale science revision guide) Temperature can be a limiting factor upon photosynthesis as the rate of photosynthesis rises as the temperature rises. However once the temperature reaches 45 C, the enzymes controlling the photosynthesis become denatured and so photosynthesis is stopped. Effect Of Carbon Dioxide Concentration: (Graph from Lonsdale revision guide) The rate of photosynthesis will rise as the carbon dioxide concentration increases, up until a certain point where the concentration of carbon dioxide will no longer be a limiting factor. Effect of Light Intensity: (Graph from Lonsdale revision guide) The rate of photosynthesis will rise as the light intensity
Factors Affecting the Rate of Photosynthesis
Factors Affecting the Rate of Photosynthesis Tim Hodgson 11M Introduction: All living green plants photosynthesise. In photosynthesis, carbon dioxide, water and light are absorbed and used to form glucose for the plant and oxygen as a by-product. As with all reactions, the rate can be changed by altering a number of factors. In photosynthesis, the most substantial variables which affect the rate are temperature, carbon dioxide concentration and light intensity. This is the premise of this experiment - investigating the limiting factors in photosynthesis. Due to restrictions in the environment, it would not be viable to alter the carbon dioxide concentration in the air in the classroom and it would be near impossible to achieve a suitable degree of accuracy if temperature was the independent variable. Therefore, light intensity had to be chosen as the factor to be investigated. The plant on which the theory and prediction will be tested will be Canadian pondweed. Aim: The aim of this experiment is to investigate how light intensity affects the rate of photosynthesis in Canadian pondweed. Variables: VARIABLE TYPE OF VARIABLE HOW MONITORED Light intensity Independent The distance between the plant and the light source will be carefully measured with a ruler Concentration of carbon dioxide Control The water will be saturated with sodium hydrocarbonate to ensure
Factors Affecting the Rate of Photosynthesis.
Andrew Dempsey Factors Affecting the Rate of Photosynthesis. Introduction: Green plants photosynthesise when it is light. During photosynthesis, a green pigment called chlorophyll absorbs light energy. The energy collected is used by the plant to convert carbon dioxide and water into glucose, and oxygen is given off as a biproduct. Carbon dioxide + water + light energy ? glucose + oxygen Variables: Variable Type Experiment conditions Light intensity Independent This will be changed throughout the experiment. Carbon dioxide Controlled The amount of carbon dioxide in the water containing the plant will be saturated using sodium hydrocarbonate solution. Temperature Controlled The experiment will be done at room temperature, which is close to optimum for photosynthesis. This will not fluctuate extensively throughout the experiment time period. Water Controlled The plant piece used will be In water throughout the experiment time period. Plant piece Controlled The plant piece used will be the same piece throughout and a healthy piece will be chosen. Preliminary Work: A program called PSYNTH was used to give some indication of the results of altering the light intensity. Light intensity was chosen as the factor to investigate, as it is easiest to carry out within the class room and time period set. The program generated these results with a
Factors affecting the rate of photosynthesis
Factors affecting the rate of photosynthesis Aims I plan to investigate how different factors affect the rate of photosynthesis. Background Information The rate of photosynthesis is affected by a number of factors including light levels, temperature, availability of water, and availability of nutrients. If the conditions that the plant needs are improved the rate of photosynthesis should increase. The maximum rate of photosynthesis will be constrained by a limiting factor. This factor will prevent the rate of photosynthesis from rising above a certain level even if other conditions needed for photosynthesis are improved. This limiting factor will control the maximum possible rate of the photosynthetic reaction. For instance, increasing the temperature from 10°C to 20°C could double the rate of photosynthesis as the plant's enzymes will be closer to their optimum working temperature. As the temperature is increased, molecules in the cells will be moving at a faster rate due to kinetic theory. If the temperature is raised above a certain level, the rate of photosynthesis will drop as the plant's enzymes are denatured. They will therefore be more likely to join onto the enzymes and react. The amount of water available to the plant will affect the rate of photosynthesis. If the plant does not have enough water, the plant's stomata will shut and the plant will be
Investigating Factors Affecting the Rate of Photosynthesis.
AT2 Biology Investigating Factors Affecting the Rate of Photosynthesis Stella Boachie How does Light Intensity Affect the Rate of Photosynthesis? Aim The aim of this coursework is to investigate whether light intensity affects the rate of photosynthesis. To do this, I will place a piece of Canadian pondweed in varying light intensities and observe the amount of oxygen given off. Introduction Photosynthesis is the process by which green plants and certain other organisms transform light into chemical energy. In green plants, light energy is captured by chlorophyll in the chloroplasts found in the palisade cells of the leaves and used to concert water, carbon dioxide and minerals into oxygen and energy rich organic compounds (sugar) that are the basis of both plants and animal life. The first step in photosynthesis is Light Dependent Processes (Light Reaction). Light strikes chlorophyll in such a way as to excite electrons to a higher energy state. In a series of reaction, the energy is converted along an electron transport process into ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate). Water is split in the process, releasing oxygen as a by-product of the reaction. The ATP and NADPH are used to make C-C bonds in the next stage of photosynthesis, Light Independent Process (Dark Reaction). In the Light Independent Process, carbon
An Investigation into the Various Factors Affecting Photosynthesis
An Investigation into the Various Factors Affecting Photosynthesis Aim: The aim of this investigation is to determine the factors that affect the rate of photosynthesis and what affect they have. Introduction: Photosynthesis is a chemical reaction that takes place in green plants. The reaction is endothermic and uses light energy to produce glucose. Green plants feed autotrophically, which means that they use inorganic substances to make organic ones, this is called autotrophic nutrition. The inorganic substances that they use are CO2, H2 O and minerals. Green plants use sunlight to give them energy to combine carbon dioxide with water, which produces glucose. This can be shown as the following word and symbol equations: Sunlight CARBON DIOXIDE + WATER GLUCOSE + OXYGEN Chlorophyll 6CO2 + 6H2O C6H1206 + 6O2 The word photosynthesis means light (photo) manufacture (synthesis). The plants need the suns light energy and so trap it in the chlorophyll, the pigment that makes them green. There are three factors that can limit the rate of reaction in photosynthesis and these are the light intensity, temperature and carbon dioxide levels available. Of course the amount of chlorophyll in the plant will affect the results but the same plant section will be used throughout the experiment. The temperature at which the experiment
Factors Affecting the Rate of Photosynthesis Lab
Factors Affecting the Rate of Photosynthesis Research Question: How does light intensity affect the number of bubbles produced by a branch of elodea in 400mL of sodium hydrogen carbonate (4g) solution in 30 seconds? Variables: * Independent: light intensity * Dependent: number of bubbles produced in a 30-second period * Control: availability/amount of water (I will assume that the elodea has a consistent volume of water available at all points on its surface), type of plant (I will be using a piece of elodea), size of elodea (the sample of elodea is a branch from a larger piece of elodea, about the same size as other branches from it), availability of carbon dioxide (the elodea is in a 400mL solution of 4g of sodium hydrogen carbonate), mass of plant (I will be using one piece of elodea for all my trials), type/color of light source (I will be using a single 40W bulb that emits what I will assume to be white light for all of my tests), angle/position of light (I am going to let the bulb rest in one spot, and for each test I do, I will move the beaker containing elodea and sodium hydrogen carbonate solution closer to or further away from the light source), amount of outside light (the room's lights will stay on, and I will include this in the measurement of light using a lux meter), time allowed for plant to photosynthesize between trials (I will let the plant sit for 1
An Experiment Investigating the Factors Affecting Photosynthesis in Canadian Pondweed
An Experiment Investigating the Factors Affecting Photosynthesis in Canadian Pondweed The experiment I am going to investigate involves exploring the effect certain limiting factors have on the rate of photosynthesis in Canadian pondweed. The formula for photosynthesis is as follows: 6CO2 + 6H2O = 6O2 + C6H12O6 Photosynthesis is the process in which green plants make use of the energy in sunlight to manufacture carbohydrates from carbon dioxide and water in the presence of chlorophyll. Water is absorbed by the roots and carried to the leaves by xylem tubes, and carbon dioxide is obtained from the air through the stomata and diffuses into the cells containing chlorophyll. Chlorophyll is a green pigment that is capable of converting sunlight energy into a latent form, stored in the plants food. Preliminary Work I am going to do this preliminary work so that I can find the boundaries for my experiment by finding the conditions needed for my experiment to work. There are three main limiting factors that could affect the rate of photosynthesis in my pondweed. These are: * CO2 levels - to adjust the amount of CO2 in the water I am using for my experiment I can add bicarbonate of soda. This will dissolve in the water and increase the amount of CO2 available for the plant to use during photosynthesis. * Light levels - these can be changed by the distance or strength of the
Investigation Into the Factors Affecting the Rate of Photosynthesis
INVESTIGATION INTO THE FACTORS AFFECTING THE RATE OF PHOTOSYNTHESIS AIM- To identify the factors affecting the rate of photosynthesis and, choosing one factor, to ascertain the effects it has. Photosynthesis is an endothermic reaction that occurs in plants, by which plants use light energy to make glucose. It needs energy from the photons of light and it is their anabolic effect on the plant that gives the energy for the reaction to take place. During this process carbon dioxide combines with water to from glucose, and oxygen is released. The glucose made then has many uses in the plant: respiration, making ATP, active uptake.... Sunlight and chlorophyll must be present for the reaction to take place, and the light is trapped in the chlorophyll: sunlight Carbon dioxide + Water Glucose + Oxygen. Chlorophyll The amount of oxygen given off is an indication of the rate of photosynthesis. The more oxygen being given off, clearly the faster the rate of the reaction, and the more photosynthesis occurring / the faster the rate of photosynthesis. POSSIBLE VARIABLES- from background research and previous experiments I know the following variables/ limiting factors to affect the rate of photosynthesis: * Light Intensity - the basic energy source * Temperature- increases enzyme reactions until the point of denature. * Water- a basic reagent- a lack of water also causes
An Experiment to Investigate Factors Affecting the Rate of Photosynthesis
An Experiment to Investigate Factors Affecting the Rate of Photosynthesis In this investigation I will be looking at how the rate of photosynthesis is affected in Canadian pond weed by light intensity. Photosynthesis requires 5 things: Carbon dioxide, water, chlorophyll, light and warmth, these are all called limiting factors. A limiting factor is a factor that determines the rate of a reaction. I will set up the experiment by filling a test tube with water and putting some pond weed in it. I will then turn the test tube upside down and place it in a beaker. I will use a lamp for the light source and to collect the result data I will count the number of bubbles given off by the pond weed per minuet. In this graph the rate of photosynthesis increases proportionally to the light intensity. To make the experiment a fair test I must ensure that all the key variables are equal apart from the light intensity. The most common biological variables that could effect the experiment are temperature, pH, light intensity, the amount of carbon dioxide present, Light colour, minerals in the water, chemicals in the water, Health of plant, size of plant and the amount of water . I will be investigating the light intensity. The other most important variables that must be controlled are temperature and carbon dioxide. I will make sure that the temperature is of an acceptable temperature
