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Investigation into one of the factors that affects photosynthesis

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Investigation into one of the factors that affects photosynthesis Plan The aim of this activity is to investigate one of the factors that affect the rate of photosynthesis in pond-weed. I am trying to find out if the distance of the pond-weed from a lamp will change the rate of photosynthesis. I will measure the rate of photosynthesis by counting the number of bubbles that are released by the stem of the pond-weed when the lamp is shone on it from different distances. What I think will happen is as the pond weed is moved further away from the lamp, less bubbles will be produced. I think this will happen because the light intensity will be less on the pond-weed as it gets further from the lamp therefore the rate of photosynthesis will not be as high. The word equation for photosynthesis is: Carbon Dioxide + Water = Glucose + Oxygen + Energy Pond-weed is being used fro this experiment because with a normal plant that does not live ...read more.


-For each reading make sure the temperature of the water is the same as when you started the experiment. -Carry out this procedure 3 times with each of your chosen different distances and record the results. Before I begin my experiment I am going to take preliminary results to practice this method before I start. Preliminary results Ammount of bubbles produced per 30 seconds Distance from light 1st attempt 2nd attempt 3rd attempt Average 10cm 63 65 60 62.7 20cm 17 14 16 15.7 30cm 9 11 10 10 40cm 3 5 5 4.3 50cm 3 3 3 3 60cm 2 3 3 2.7 70cm 2 2 2 2 80cm 1 1 2 1.3 90cm 0 0 0 0 100cm 0 0 0 0 These preliminary readings fitted what I expected so I am not going to change my experiment. Observations Ammount of bubbles produced per 30 seconds Distance from light 1st attempt 2nd attempt 3rd attempt Average 10cm 67 46 61 58 20cm 40 14 18 24 30cm 10 ...read more.


In other words, the rate of photosynthesis decreased as the light intensity was less. Evaluation If I repeated my experiment I could change it by taking more readings for each distance to make my results and average more reliable. I could also change it seeing if my results change much if a bigger piece of Elodea is used for the experiment. My experiment because I experimented the variable I chose to investigate thoroughly, I used 10 different distaces and tested each one three times to gain an accurate set of results. My experiment was nreliable because for each reading the temperature of the water was not exactly the same so this would have affected the rate of photosynthesis and affected my results. My experiment was also unreliable because the distances I measured from the lamp may not have been exact so this may have not made my results precise. Overall I think my experiment was successful because I found out what it was that I wanted to find out, how does light intensity affect the rate of photosynthesis. Alex Arkley 10.M2 ...read more.

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