The Effect of light Intensity on Photosynthesis
The Effect of light Intensity on Photosynthesis Of Elodea Canadensis Introduction I wanted to find out how much the light intensity affected the Photosynthesis in Elodea Camadensa. I decided to do this by measuring the amount of oxygen created during photosynthesis. Photosynthesis is the procedure all plants go through to make food. This process uses Carbon dioxide, water and light energy. It produces Oxygen and Glucose. Carbon dioxide + water Light Energy glucose + oxygen Chlorophyll 6CO2 + 6H20 Light Energy C6 H12 O6 + 6O 2 Chlorophyll Photosynthesis occurs in the leaves of the plant in the palisade layer. Chlorophyll in the cells in the palisade layer absorb light for photosynthesis. The plant releases the oxygen created in photosynthesis back into the air but it uses or stores the glucose for energy, respiration, growth and repair. The leaves and plants are also specially adapted for photosynthesis in their structure and cell alignment. Preliminary Experiment Apparatus * Piece of Elodea Canadensis * Bulb * Voltmeter * Test tube * Beaker * Box * Two electrical wires * Stopwatch * Thermometer Method I put a piece of Elodea Canadensis (pond weed) in a test tube and covered it with water. The test tube was then placed in a beaker with a thermometer so that the water stayed
Investigating the effect of Light Intensity on Elodea.
Investigating the effect of Light Intensity on Elodea Aim: The aim of my experiment is to determine whether or not the intensity of light would affect the rate of photosynthesis in a plant. To do this I will place different pieces of Elodea (pondweed) into a beaker and expose it to varied light intensities, and observe the amount of oxygen given off by the plant. Introduction: Photosynthesis is the process of converting light energy into chemical energy and storing it in the bonds of sugar. Photosynthesis occurs only in the presence of light, and takes place in the chloroplasts of green plant cells. Photosynthesis can be defined as the production of simple sugars from carbon dioxide and water causing the release of sugar and oxygen. It is the chemical process, which takes place in every green plant to produce food in the form of glucose. Plants use the suns energy to join together water and carbon molecules to make the glucose, which is sent around the plant to provide food. Cells in the root or stem can use the glucose to make energy, if the plant does not need to use all the glucose immediately then it is stored as starch. It is possible to measure the rate of photosynthesis by counting how many bubbles or the volume of oxygen produced. In this experiment I will collect data to see if it supports my prediction. The following chemical equation summarises
Investigating the effect of light intensity on photosynthesis
Investigating the effect of light intensity on photosynthesis Prediction As the light intensity increases so will the rate of photosynthesis will increases also. This is because the more if light hit's the leaf more electrons are knocked out of the chlorophyll. This is replaced by a water electron, the water electron is then broken down by photolysis (H2O = H2 + O) this produces the oxygen given off by photosynthesis (6CO2 + 6H2O = C6H12O6 + 6 O2). So the more light the more this will happen. Fair test I will make sure all another things will remain the same apart from the light intensity, I will use excess amounts of sodium hydrogen chloride to ensure the plan has enough CO2 at all times also use more than enough water for the same reason, however the things I cannot control like temperature or sunlight this I will take into account in my evaluation. Equipment Beaker Canadian pondweed Meter ruler Lamp Thermometer Sodium hydrogen carbonate Stopwatch Safety I will make sure the experiment is safe I will Wear a lab coat Wear safety spectacles Make sure the lamp is stable and will not fall into the beaker as we are using water and electricity Make sure the beaker is in the middle of the bench so it has a less likely chance of falling off and smashing Be careful when moving the lamp because it gets very hot Method Place a length of Canadian
Investigate the effect of light intensity on photosynthesis.
Daniel Rollé Biology Coursework Aim: To investigate the effect of light intensity on photosynthesis. Introduction: This investigation seeks to find a relationship between light intensity and the rate of photosynthesis. Photosynthesis is a chemical reaction occurring in the leaves of green plants. Using the energy from sunlight, it changes carbon dioxide and water into glucose and oxygen, to be used as energy by the plant. Photosynthesis happens in the mesophyll cells of leaves. There are two kinds of mesophyll cells - palisade mesophyll and spongy mesophyll. The mesophyll cells contain tiny bodies called chloroplasts, which contain a green chemical called chlorophyll. This chemical is used to catch the light energy needed in photosynthesis Plants can absorb and use light as an energy source, because plants contain the green pigment, known as chlorophyll, which allows the energy in sunlight to work chemical reactions. The chlorophyll is contained in chloroplasts, and these work as 'Energy Transducers' that convert light energy into chemical energy. Photosynthesis also needs certain conditions to operate in the optimum way these include: * Chlorophyll * Carbon dioxide (from the air) * Water (from the soil) * Sunlight energy (any light will do except green light) There are also certain factors that limit photosynthesis, these include: * Light Sometimes light
Experiment to test the effect of varying light intensity
Experiment to test the effect of varying light intensity on the power output of a solar cell PLANNING Theoretical Background. Photovoltaic (solar) cells are cells that generate an electromotive force (EMF) and therefore provide a current without a battery. The cell consists of a junction between two different materials, often p-type silicon and n-type silicon and light of certain wavelengths is able to ionise the atoms in the silicon. The junction allows the ionised electrons to spontaneously drift from one material to the other. This causes an overall positive charge to build up in the material losing electrons and a negative charge in the material gaining electrons. The electromagnetic radiation (light) gives the electrons enough kinetic energy to move freely and a current within the circuit is produced. Diagram to show the photovoltaic effect in a solar cell What effects power output of a cell? The amount of power available from a photovoltaic device will depend on: * The type of material * The area/size of the material * The intensity of the sunlight * The wavelength of the sunlight * The age/efficiency of the PV cell * The heat/temperature of the solar cell The effect of light intensity on the power output of a cell : A single crystal silicon cell cannot (currently) convert more than 25% of the solar energy into electricity, and a cell of 100cm2
Investigating The Effect Of Light Intensity On Cress Seedlings.
Investigating The Effect Of Light Intensity On Cress Seedlings Aim - To investigate whether or not light intensity affects the growth of cress seedlings. Hypothesis - I predict, the higher the light intensity, the more the cress seedlings will grow. Theory - The theory of photosynthesis states that a plant needs 4 things to photosynthesise and make food (glucose) for itself; these are light, chlorophyll, carbon dioxide and water. In addition, 3 factors affect the rate of photosynthesis; they are light intensity, carbon dioxide and temperature (as I am testing light intensity, carbon dioxide and temperature will be ket as controls to ensure a fair test). If the light intensity is low, the rate of photosynthesis, and growth of the seedlings, will slow down as well. This is because the chlorophyll in the cress can only photosynthesise and grow as fast as the light energy is arriving. Plan Of Investigation - I will gather 6 petri dishes and put black card on top of them. These cards will have a certain varying number of holes made in them to alter the light intensity the seedlings in each dish get. The seedlings will be put in damp cotton wool and will be left on a windowsill for 1 week. This will mean they will all be at the same temperature, and they all get the same strength of sunlight, just the intensity will alter, so it will be a fair experiment. My independent
Investigation into the effect of Light Intensity on Photosynthesis.
Investigation into the effect of Light Intensity on Photosynthesis by Dominic Mulley Introduction Photosynthesis is the process that produces 'food' in plants. The 'food' that it produces is called glucose. Photosynthesis takes place in the leaves of all green plants. Leaves are especially to make photosynthesis: - Leaves are thin and flat to provide a large surface area to absorb as much sunlight as possible. - The palisade cells are near the top of the leaf and are packed with chlorophyll. - Guard cells control the movement of gases into and out of the leaf. They line the bottom of the leaf. An equation can be demonstrated to show how a plant produces photosynthesis and what substances it uses: Carbon + Water + Sunlight Glucose + oxygen Dioxide Chlorophyll 6CO2 + 6H2O + Sunlight C6H12O6 + 6O2 Chlorophyll The rate of photosynthesis depends on light intensity, carbon dioxide and temperature. Sometimes increasing these factors has little or no effect. This is because one of the other factors is so low that it limits the rate of photosynthesis. Scientists call this the limiting factor. Chlorophyll in green leaves uses light energy to perform photosynthesis. It can only do it as fast as the light energy is arriving. Chlorophyll only actually absorbs the red and blue ends of the visible light spectrum, but not the green light in the middle, which is
EFFECT OF LIGHT INTENSITY ON THE GROWTH OF PLANT.
IB BIOLOGY HL CANDIDATE NUMBER- EFFECT OF LIGHT INTENSITY ON THE GROWTH OF PLANT. AIM: TO INVESTIGATE THE FACTORS AFFECTING LEAF SIZE IN WILD CHERRY PLANT . DESIGN: RESEARCH QUESTION: WHETHER THE LIGHT INTENSITY CAN INFLUENCE THE GROWTH OF THE LEAF OF WILD CHERY PLANT? HYPOTHESIS: My prediction is that plant exposed to/ growing in the region of bright light has a leaf with more surface area(longer and wider),compared to the one growing in a shaded area which would be shorter in length and width(lesser surface area), based on my knowledge that light is a factor affecting the growth of plants,thus in this case it would be a limiting factor for those plants in shaded areas. VARIABLES: A.)INDEPENDENT VARIABLE: In this case,the indepent variable would be the different area's/regions the plant is taken from,as one is taken from an area of bright light and the other from a shaded area. B.)DEPENDENT VARIABLE: THE LENGTH AND Breadth are dependent variables, as they both depend on the area of the plant,whether exposed to bright sunlight or not. C.)CONTROLLED VARIABLE: We controlled that both the branch had come from the same type of plant(same species), while measuring plants from shaded areas for example, we controlled that all leaves are taken from the same tree and same branch,another factor we tried to control would be that both plants (one from shaded area and one
The Effect of Light Intensity On the Rate of Photosynthesis.
Experiment: The Effect of Light Intensity On the Rate of Photosynthesis Introduction Photosynthesis is the process in which plants create simple forms of sugar known as glucose. The plants use the food that is made from this process in respiration and many other things that can help the plant. These include producing cellulose for cells and when glucose is combined with nitrates in the soil they can react together to make proteins. Respiration is where food molecules are broken down to release the chemical energy which is 'locked up' inside by using the light energy from the sun. For this useful product of glucose to be made from photosynthesis, plants must have three materials to begin with. The raw materials required are water, light energy and carbon dioxide. The chlorophyll, which is found in the chloroplasts, absorbs the light energy which is then be utilised in photosynthesis. Photosynthesis can be written as a word equation: - Sunlight Carbon Dioxide + Water -------------> Glucose + Oxygen Chlorophyll CO2 +H2O ----> C6H12O6 + O2 For photosynthesis to happen, green plants require light energy, carbon dioxide and water. The sun supplies the light energy; the carbon dioxide can be found in the air and the water in the soil. During photosynthesis, two new reactants are created by the chemical reactions between the original products. These are glucose and oxygen.
The effect of light intensity on the rate of photosynthesis.
Owen Davies GCSE Coursework The effect of light intensity on the rate of photosynthesis. Plan: Aim: To investigate the affect of light intensity on the rate of photosynthesis. Theory: Before I predict what will happen I must look at how photosynthesis occurs. Photosynthesis is the way plants create a source of food for themselves. Photosynthesis requires the following resources; Carbon Dioxide, Water and light. Inside the leaves of a plant there is a green substance, this substance is known as chlorophyll. Chlorophyll is in the Chloroplast which are cells contained inside a plant. Chlorophyll absorbs sunlight and then makes the energy from the sunlight available for chemical reactions. This shows that Chlorophyll is used to convert light energy to chemical energy. The plant can absorb carbon dioxide from the air. It can also uptake water from the soil. A plant also requires nitrogen and sulphur to create proteins; these can be acquired from nitrates and sulphates which are minerals in the soil. The equation for photosynthesis is: How photosynthesis works. The process mainly takes place inside the cells of plants, mainly in the leaves. Firstly the plant needs water; this is absorbed from the soil, through the roots and is carried up the stem by water vessels within the veins. Next the plant needs carbon dioxide, this absorbed from the through pores in the leaf known as
