# An experiment on the effects of light changes on photosynthesis

Baking soda is added to the test tubes to provide adequate amounts of carbon dioxide for photosynthesis to occur.

Experimental Design This experiment will look at the affect of light intensity on the rate of photosynthesis on Elodea plants.

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.

Independent variable Time is the independent variable and will be measured with a stop watch. Repeat twice and calculate a mean bubble count — number of bubbles per minute. Applying petroleum jelly to the outer surfaces of the rubber stoppers may help to form an airtight seal.

Using a balance, weigh 2. The high measurement for the 10cm trials can also be explained by the arrangement of the cuvettes, which caused each cuvette to cast a shadow upon the next cuvette, removing light and thus meaning that only the first cuvette at 10cm received the intended amount of light.

Because 6 retakes where made, an average was made with its uncertainty calculated. The chloroplast solute containing many enzymes and co-enzymes would have had its activity affected by the temperature at which it was stored and the temperature it was subject to during the experiment, therefore a possible source of inaccuracies could have originated from this and more reactions where happening due to high temperature increasing rate of reactions.

What gas is being produced in the flasks by Elodea? Set the flasks in the sun. The six cuvettes were thoroughly shaken and placed alongside a ruler at distances of 15, 30, 45, 60, 75 and 90 cm each. Evaluation Firstly, this lab did not measure the rate of photosynthesis as DCPIP blocked the procedure from occurring early on, so claiming that this lab measured the rate of photosynthesis does not make sense and we should focus on the fact that we are only observing and assessing the first steps of photosynthesis.

Use the absorption spectrum for chlorophyll a and chlorophyll b Fig. Yes, light intensity does affect the rate of photosynthesis.

Students should be thinking about the question they will raise about the photosynthesis experiment and if an investigation can be designed to test their question.

The water level should reach between the 0. Was your hypothesis supported? This will be measured by counting Series Study the number of bubbles formed dependent variable as a function of time independent variable at various light distances from the test tube.Different wavelengths of light affect on photosynthesis rates in tomato plants.

The Plan In my experiment I am going to see how light affects the rate of photosynthesis. To do this experiment I am going to set up the apparatus as shown in figure 1.

The apparatus I am going to use are the following: 1 Tripod 1 ml Beaker 1 Boiling Tube 1. This activity is a lab where students design an experiment to test the rate of photosynthesis.

Students will analyze data,write a report using the scientific method, and apply results to current environmental issues. the variables of light intensity, temperature, carbon dioxide, light quality all influence the rate of photosynthesis.

The effects of light on photosynthesis The animation below describes an experiment to investigate the effects of light on photosynthesis.

The affect of light on photosynthesis can be investigated using the experimental setup shown.

- The Effect of Light Intensity on the Rate of Photosynthesis Experiment: An experiment to investigate the effect of light intensity on the rate of photosynthsis. Aim: We will be trying to see if light intensity has an effect on the rate of photosynthsis.

each color effects the photosynthetic rate. Light Filters are used and. This experiment will look at the affect of light intensity on the rate of photosynthesis on Elodea plants.

The rate of photosynthesis is determined by the number of bubbles formed by the Elodea plants.

Increasing the light intensity will boost the speed 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.

An experiment on the effects of light changes on photosynthesis
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