Get Full Essay Get access to this section to get all help you need with your essay and educational issues. Light wavelength effect on the photosynthetic rate of elodea Essay Sample Introduction: The rate of photosynthesis varies greatly with changes in wavelengths of light.
There is a slight risk of infection from pond water, so take sensible hygiene precautions, cover cuts and wash hands thoroughly after the work is complete. However it is probably a good idea to replace it every so often with a fresh supply from an aquarist centre or a pond.
On the day of the experiment, cut 10 cm lengths of Elodea, put a paper-clip on one end to weigh them down and place in a boiling tube of water in a boiling tube rack, near a high intensity lamp, such as a halogen lamp or a fluorescent striplight. Check the Elodea to see if it is bubbling.
Sometimes cutting 2—3 mm off the end of the Elodea will induce bubbling from the cut end or change the size of the bubbles being produced. It does, though tend to break apart very easily, and fish may eat it very quickly.
Ethical issues Look out for small aquatic invertebrates attached to the pond weed used, and remove them to a pond or aquarium. Procedure a Set up the apparatus as shown in a darkened room.
Repeat twice and calculate a mean bubble count — number of bubbles per minute. This is the mean rate of bubble production. Refer to teaching notes. Repeat the count and calculate the mean rate of bubble production as before. Teaching notes An assumption being made in this experiment is that the gas bubbles being counted are only oxygen, and that production of oxygen is proportional to the rate of photosynthesis.
Another assumption is that all the bubbles are the same size. A variable that is hard to control is the effect of temperature as the lights used may heat the water.
LED lamps produce less heat. You can develop more accurate measures by collecting the gas produced and measuring the volume of gas produced each minute or over longer time periods. One method of doing this is to cut the graduated portion from the tube of a plastic teat pipette, fill the tube with water, plug the smaller hole with plasticine or blu-tack and invert the tube over the bubbling stem.
The students can be allocated to investigate a particular factor that affects the rate of photosynthesis, or they can choose from this list, or they can develop their own ideas. Light intensity or distance of the Elodea from the lamp. Temperature of the water Carbon dioxide concentration.
The available mass of carbon dioxide increases with each addition. Coloured filters can be used, but these will affect light intensity by different amounts depending on the colour.
Students should collect and set up all the other apparatus before collecting the boiling tube of pond weed. Check the weed to see if it is bubbling. Sometimes cutting 2—3 mm off the end of the weed will induce bubbling from the cut end, or change the size of the bubbles being produced.
The students could develop this practical as an assessed investigation if they develop hypotheses and plan the experimental detail from the core protocol. Health and safety checked, September Downloads.#41 Effect of Light intensity on the rate of Photosynthesis.
However, at high light intensities the rate becomes constant. Experiment. Place a pond weed Elodea upside in a test tube containing water.
Place the tube in a beaker of fresh water at 25°C. This helps to maintain a constant temperature around the pond weed. This is the rate. - Determining the Effect of Light Intensity on Photosynthesis Aim In this experiment, I intend to alter the light intensity and measure its effect on photosynthesis through the production of oxygen Introduction Photosynthesis is the process by which green plants provide a source of .
The Effect of Light Intensity and Temperature on the Rate of Photosynthesis - The Effect of Light Intensity and Temperature on the Rate of Photosynthesis Aim The aim of my experiment is to determine whether intensity of light and temperature would affect the rate of photosynthesis in a plant.
From the table, it is clear that light intensity on the pondweed effects the time taken for the hydrogen carbonate indicator to go from red to purple as high light intensity produced an average of minutes where low intensity produced an average of 35 minutes.
LAB 2: Experiments in Carbohydrates Photosynthesis – light intensity and color effects Photosynthesis is as the heart of almost all terrestrial ecosystems. It the process evolved in plants, to harness the energy from the sun and to use it to fix carbon.
The effect of colored light on the rate of photosynthesis in elodea 1. Repeat the same. Besides the light factor I also decided to put a watt lamp above each plant so I get a high light intensity to speed up the rate of photosynthesis. Aim: The purpose of this experiment is to find out under what wavelength (different colour of light) the elodea .