# Biology - How Light Intensity Affects the Rate of Photosynthesis

2153 Words9 Pages
Biology Coursework ¡V Does The Light Intensity Affect the Rate of Photosynthesis The Investigation In this experiment I will investigate the affect in which the light intensity will have on a plants photosynthesis process. This will be done by measuring the bubbles of oxygen and having a bulb for the light intensity variable. Variables The input variable which will be used in this investigation will be the light intensity (this will be a 100Watt bulb being moved closer and further away from the plant). The outcome variable which will change as a result of this experiment will be the amount of oxygen made in the experiment due to the amount of light intensity increases (causing the plant to photosynthesise more). Prediction I predict…show more content…
When I do this, I will then find the light intensity by dividing the number which came up on the light meter into 1; this will be the light intensity. During the preliminary experiment I did not come up against any noticeable problems so no solutions where needed. Plan The plan or method I will be using will start of by placing a plant in a test tube filled with water. This test tube will then be held by a clamp stand and around 100 cm¡¦s across from the clamp stand there will be a lamp with a 100 watt bulb in it. The 100 cm ruler will be placed between the clamp stand and lamp so you know how far to move the lamp after you record the bubbles for each light intensity. The light intensity will by using the light meter to record the readings at 100cm75cm, 50cm and 25cms, then dividing the number which comes up on the light meter into one and the way they will be recorded are as follows: 1) Turn on lamp for 1min 2) Start stop watch after 1min of the light being on 3) For 1min record the bubbles starting at the same time as the stopwatch 4) Write down results, then leave lamp off for 1min then repeat the process for each measurement 3 times. I will intend to plot a graph. Going up on the graph shall be the amount of bubbles and going across on the X axis will be the measurement. The amount of bubbles recorded on the graph will be the averages for each measurement (the reason for doing three results). The graph title will be