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# The effects of light intensity on the rate of photosynthesis

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Introduction

The effects of light intensity on the rate of photosynthesis Plan I am going to investigate the effect of varying light intensity, this will determine whether the brighter the light the faster photosynthesis will happen or not. In this investigation I will use the same equipment every time I repeat the investigation to try and get more accurate results. The equation for the reaction is: Carbon dioxide + water glucose + oxygen Equipment - Beaker - Stopwatch - Canadian pond weed - Water - Artificial light - Paper clip - Ruler Prediction I predict that if the light intensity is high, photosynthesis is going to happen much faster, but if there is less light intensity photosynthesis will not occur as fast as the Canadian pond weed with a high light intensity. Safety To conduct my experiment safely I will follow normal laboratory rules, which include: - The wearing of safety goggles to protect my eyes from chemical splashes. ...read more.

Middle

Range The range that I am going to use will be zero centimetres up until fifty centimetres. I will move the lamp ten centimetres every time. Method 1 First collect all equipment and set it up. 2 We are going to cut the end of the Canadian pond weed and attach a paper clip to the end. 3 Then we will put the pond weed in to a beaker and add warm water. 4 As soon as we see bubbles in the water we will start the stopwatch and time for one minute. 5 When we are timing we will count how many bubbles are produced. 6 At the end of one minute we will move the lamp away ten centimetres until I reach 50 centimetres and repeat the process in 2-5, until we have three results for each distance that the lamp has been moved. ...read more.

Conclusion

My results support the prediction I made because I said that if the light intensity is high photosynthesis is going to happen much faster, but if there is less light intensity photosynthesis will not occur as fast as the Canadian pond weed with a high light intensity. Evaluation My experiment went according to plan but there were flaws in it. For example, I could have done more tests to gain a more reliable average. There were a couple of anonymous results, but when I calculated the averages the anonymous results didn't make a difference. I also think that there is an element of human error involved because handling the pond weed may have an affect and also the lamp that was used may not have been moved accurately. The anonumus results may have happened because the temperature may have dropped or increased, the amount of carbon dioxide may have dropped or increased, and there was a factor of light intensity this is the light outside may have affected the results. James Frampton Biology Coursework ...read more.

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