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# Investigate the relationship between light intensity and the rate of photosynthesis.

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Introduction

Photosynthesis- year 10 Investigation. Investigate the relationship between light intensity and the rate of photosynthesis. Photosynthesis is important because animals eat food, as it is a source of energy. All living things need a constant supply of energy if they are to grow, reproduce or move. Plants do not eat food but they do have some in the form of starch in their leaves. The symbol equation for photosynthesis is: 6 CO2+6 H2O-light C6 H12 06+6 02. There are four substances needed for photosynthesis to tae place: -Carbon dioxide. -Chlorophyll. -Oxygen. -Sunlight. Photosynthesis cannot take place without all four of these substances being present. As light is the factor I am exploring in this investigation, that is the main factor I am looking at. Plants need light for photosynthesis to take place; photosynthesis will not take place in the dark. It is true that the brighter the light, the greater the rate of photosynthesis. Many plants have their leaves spread out in such a way that each leaf has as much light as possible and the lower leaves are not shaded by the ones above. ...read more.

Middle

If the temperature gets higher then you will need to empty out that water and use the same temperature water that you began with at the first intensity of light. To make sure that you get the same temperature at the beginning and during each experiment you will need to record the temperatures with a thermometer and write them down. To measure the distance from the beaker to be sure that the light intensity is at each distance from the beaker that I have chosen, 10cm to 90cm, I will use a metre ruler. I will need these readings at each distance so that I can get an average amount of bubbles. Then round up that number to the nearest whole number. I predict that the results will show that, as the light gets further away, the amount of bubbles becomes less. Analysis and conclusion. After carrying out the experiment to investigate the effect of light intensity on the rate of photosynthesis of a pond plant. The experiment was repeated for different distances and the results are below: Distance (cm) ...read more.

Conclusion

So it agreed with what I had thought and planned. I chose the correct equipment and distances, which worked to make the experiment correct and fair. The experiment is a very safe one s there is not really any safety precautions to take when carrying out this experiment. To make it fairer you would need to look at the mass of the bubbles because not every bubble will be the same size and could have a different volume, which would make the test unfair. That is how you would have to improve it to make the test more reliable. There is a difference in the graph, if you look at the results then you will notice that the average amount of bubbles gets less and less as the distance gets further and further away. It is going down in a pattern until lot gets to 60 cm away then it goes back up to 5cm 3, from 4cm 3, this is odd and after checking the results and averages again and again it is the correct average. I think to make the test fairer and more accurate we would of had to of done the test for ourselves to change certain points of the experiment. ...read more.

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