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The effect of light intensity on the rate of photosynthesis.

In this experiment we were told that we would be measuring the rate of photosynthesis.

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Oxygen production is used to measure the rate of photosynthesis.

Background information: Photosynthesis Photosynthesis is the process of autotrophs turning carbon dioxide and water into carbohydrates and oxygen, using light energy from sunlight.

Photosynthesis need light to work, so light therefore should speed up the rate of photosynthesis.

I think this
because I already know that a plant needs sunlight to be able to
perform photosynthesis as shown in the formula below:


Water + Carbon dioxide>> Sunlight>> chlorophyll>> Glucose + oxygen

Also I know that if you increase anything on the left-hand side of
this formula (the part I have boxed on the diagram above), everything
on the right hand side will increase (Increase of input = increase of
output.)This means that if the concentration of light were to be
increased, the levels of glucose and oxygen (The rate of
photosynthesis) will increase.

Investigating Factors Affecting the rate of photosynthesis.

Photosynthesis should not occur if one of the limiting factors is not present.

Prediction : I predict that as I increase the distance between the light source and the Canadian Pondweed (reducing the light intensity), the volume of oxygen produced within the time limit (the measure of the rate of photosynthesis) will decrease.

It could also be due to light
coming from other sources to our experiment causing the rate of
photosynthesis to rise with the light coming in though I do not know
however how this could have happened in all 3 experiments.

Three factors can limit the rate of photosynthesis will decrease.

Aim: To see if raising the light intensity increases the rate of photosynthesis.

6CO + 6H O ® C H O + 12O (in the presence of light energy and chlorophyll) Aim- The aim of the experiment is to determine what effect light intensity has upon the rate of photosynthesis of Canadian Pondweed (Elodea)....

Below is a line graph of my average results:


This line graph also shows how the rate of photosynthesis rises after
45cm, If we had not done further research into this we would have
found it very unlikely that these results are anomalies because each
time we did the 3 experiments the same pattern has occurred, this
could be down to coincidence but the same pattern occurring 3 times
would be very unlikely.

Factors Affecting Rate of Photosynthesis.
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  • Limiting Factors of Photosynthesis.

    I am trying to find out if the distance of the pond-weed from a lamp will change the rate of photosynthesis.

  • Plants;.Factors affecting the rate of photosynthesis.

    Hypothesis: The rate of photosynthesis in the water plant hydrilla will change as the rate of carbon dioxide changes.

  • gives an increase in the rate of photosynthesis.

    Prediction:I predict that raising the light intensity will increase the rate of photosynthesis.

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The Effect of Light Intensity and Temperature on Photosynthetic Rate.

Three factors can limit the speed of photosynthesis: a plant cannot photosynthesise very quickly.A free PowerPoint PPT presentation Plant Processes and Factors That Affect Them food for the plant ; 5 Why Photosynthesis is Essential to CO2/O2 Exchange.

Investigation into the Factors Affecting The Rate Of Photosynthesis.

Furthermore, I predict that if the light intensity increases, the rate of photosynthesis will increase at a proportional rate and more oxygen will be produced and therefore the oxygen levels will increase.

The three main things affecting the rate of photosynthesis are: 1.

Three factors can limit the speed of photosynthesis: a plant cannot photosynthesise very quickly.A free PowerPoint PPT presentation Plant Processes and Factors That Affect Them food for the plant ; 5 Why Photosynthesis is Essential to CO2/O2 Exchange.

Light.A good ppt about limiting factors on photosynthesis.

To get
more accurate results I will repeat the experiment 3 times if possible


Using my scientific knowledge and the research that I have been doing
I would predict that light intensity will affect the rate of
photosynthesis in this way: The closer the lamp is to the elodea the
stronger the light intensity will be, I know this because we have
being doing tests to measure the light intensity using specialist

Photosynthesis limiting factors ppt.

Because we need the experiment to be a fair
one and we know from our research that temperature can affect the rate
of photosynthesis we needed to cut down the heat transferring from the
light to our experiment as much as we can.

Plants;.What are some of the factors that affect photosynthesis?

Another thing that I have to make sure is
the same throughout the experiment is the water temperature, I will do
this by putting the boiling tube with the elodea in it into a beaker
also filled with water, the outer layer of water would soak up and
excess heat energy coming from out light source, as mentioned above.

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