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Find the factors, which affect the rate of photosynthesis.

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Introduction

Rate of Photosynthesis Aim: - The aim of my investigation is to find the factors, which affect the rate of photosynthesis. Introduction: - Photosynthesis is the name given to the process in which plants make their food. In order for a plant to photosynthesise, it needs carbon dioxide, sunlight, and water. The water and carbon dioxide are converted into glucose (food) and oxygen, sunlight is also needed as part of the reaction, and this sunlight is taken in by green pigment, called chlorophyll. Chlorophyll is present in the leaves of all green plants, and it is in these leaves where photosynthesis occurs. Here is the word equation for photosynthesis: Here is the chemical equation for photosynthesis; Hypothesis: - Qualitative Hypothesis: 1. I predict that the greater the light intensity, which the plant is receiving, the greater the rate in which the plants will photosynthesise (Canadian pondweed) and more oxygen is released. 2. I predict that the lower the concentration of carbon dioxide that the plant is receiving, the lower the rate in which the plant will photosynthesise and less oxygen is released. 3. I predict that the lower the light intensity that the plant is receiving, the lower the rate in which the plant will photosynthesise and less oxygen is released. ...read more.

Middle

4. Discrete variables are whole values or one value or another. E.g. the type of plant we will be using. Here are some examples of variables: * The volume of water, this is an independent and continuous variable. * The length of the Canadian pondweed, this is an independent and continuous variable. * The size of the beaker, this is an independent and a discontinuous variable. * The distance of the lamp from the beaker, this is an independent and continuous variable. * The temperature of the water, this is an independent and continuous variable. * The concentration of carbon dioxide (CO2), this is an independent and continuous variable. * The room temperature, this is a dependent and continuous variable. Apparatus: - * 5cm2 of Sodium Hydrogen Carbonate (bicarbonate) solution, * Two cut-shoots of pond weed, * Two glass rods, * 500ml beakers, * Thermometer, * Bench lamps, * Stop clock, * Scissors, Fair test: - In order to make my experiments as fair as possible I will carry out the following: * I will alternate the temperature of the water for the specified experiments. * I will alternate the concentration of bicarbonate for the specified experiments. * I will alternate the intensity of light for the specified experiments. ...read more.

Conclusion

My results can also be scientifically proven, as it is well known that as part of photosynthesis plants need carbon dioxide, sunlight and water. The carbon dioxide is absorbed through tiny pours called stomata, water is absorbed from the soil by the roots, this passes up the root stem through narrow tubes called xylem vessels, and sunlight is absorbed through the leaves by tiny green pigment called Chlorophyll. Evaluation: - Even though I tried my best, my results could still be more accurate. I could improve this by using a computer to help me count the number of bubbles released per minute as sometimes during the experiment bubbles were being released too fast for me to count. This failure to count the exact number of bubbles released would have effected the accuracy of my results. My results could have been much clearer if I had used a fresher bunch of pondweed, this is because the bunch which I used a couple of days earlier. Using an old bunch of pondweed would have effected my results, as the number of bubbles released would have been less than normal. A Very Good Piece of coursework Dan. I have corrected some minor mistakes and your current coursework grade for this piece is a B. In the future please try and hand in your Coursework on time! Dan Ly 21/11/03 Mr Parker Coursework Grade: B 1 ...read more.

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