How does lumination intensity affect the rate of

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In this test, we were testing the rate of photosynthesis in elodea. For a plant to photosynthesize, it takes carbon dioxide and water and sunlight, one factor of photosynthesis. In order for us to measure the rate of photosynthesis, we needed to gauge the products that have been made, sugar and o2. As air was a visible product, we counted the oxygen bubbles made when we moved the original source of light.

Hypothesis: Crops need light to photosynthesize. In this research, the light intensity is transformed by changing the distance in the source of lumination closer or further away from elodea, therefore theoretically, when the intensity turns into stronger as a result of light source staying closer to the Elodea, the interest rate of photosynthesis should maximize and therefore the range of oxygen bubbles will increase as well. From additional away, the light intensity will probably be less, and thus light will be a limiting component, however when we all increase the light intensity by simply moving the source of light nearer towards the Elodea, which then ensures that light cannot be the constraining factor of photosynthesis. While light is no longer the constraining factor of photosynthesis, it is going to then photosynthesize at a higher rate until another variable becomes a restricting factor.


  • Elodea
  • Lamp
  • Beaker
  • Test out tube
  • Water
  • Meter ruler
  • Stopwatch
  • Channel

Technique: Firstly, you fill the beaker with water make the Elodea inside. Place the funnel together with the elodea overturned, and place the test pipe on top of the funnel. Build your colocar ruler and lamp 60 cm away from the Elodea. Record the data accumulated over five minutes and depend the pockets that surge to the area. Repeat this with 40cm, 30cm, 20cm, and 10cm. Record the data. So the experiment is fair to repeat the experiment 3 times to gather an agressive from your info if you have time.


Impartial variable:

  • Mild intensity

Centered variable:

  • Level of the natural photosynthesis
  • Number of o2 bubbles made
  • Controlled variable:

    • Time when the oxygen bubbles are counted should be the same (5 min)
    • The space between the elodea and the light fixture
    • The temperature of the water
    • The mass of Elodea
    • The quantity of drinking water

    Risk Examination: How it is usually avoided?

    The Elodea could show up on the floor plus the water could spill

    Maintain your water and Elodea away from the edges of the table and make sure that it is far from anything it could damage, e. g. literature or any power outlets.

    A glass equipment can break,

    Use plastic material utensils or perhaps handle every equipment as well as with extreme care

    I believe that my hypothesis was valid based on my results, not including the 20cm measurement. I believe that the higher the light power is, boosts the rate of photosynthesis as it is would no longer be a limiting factor of photosynthesis and then the plant would photosynthesize by a higher rate, which can be shown within my results. My own investigation provides proved proof to support my personal hypothesis. Analysis: Overall, there was an increasing pattern, however by 20cm there was an abnormality that happened as it did not follow the routine that the additional results exhibited. However , this might have been as a result of a number of elements, the plant may have been tired or there could had been another constraining factor, elizabeth. g. heat or co2. One of the factors that we cannot control was your size of the oxygen pockets or the regarding the plant which may have influenced our try things out. I do not believe that our measurements were accurate due to influential elements that may include affected the results. There were external lumination intensities that also may include influenced the results. To further improve my research, I would

    • Make sure that not any other lumination sources may affect the experiment, to close each of the blinds and
    • Measure the air produced utilizing a capillary pipe or another unit which could evaluate more accurately simply how much oxygen can be produced.
    • To avoid the lamp being crooked and never providing the entire beam intensity the lamp could be fixated other than to move it closer to the Elodea
    • .

    • Because light could also be sourced from your other tests, have lamps facing contrary directions when doing experiments on the desk, or alternatively execute the test in independent rooms
    • To get rid of any other anomalies, the test could be repeated three times.
    • Different components of Elodea should be used in each experiment while the Elodea’s photosynthesizing charge decreases after some time.

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