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The effect of light intensity on the rate of photosynthesis

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

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rate of photosynthesis experiment method

Oxygen is evolved during photosynthesis but the conditions for maximum reaction rate are intriguing. It can be affected by many things, including: sunlight - its intensity and wavelength, temperature, CO2 and O2 availability, water (which closes stomata and restricts CO2), and any factor that influences the production of chlorophyll, enzymes, or the energy carriers ATP and NADPH, such as pH and Mg2+ availability. You could test the effect of pH and temperature. It sure won't be linear but how well your prediction (hypothesis) and results agree will be interesting. You could also try light intensity. If you don't have a "luxmeter" to measure intensity you could take advantage of the fact that as you double the distance of the light source to the plant, the intensity is quartered (but you'd have to cut out daylight). There are a lot of variables to control and complex biochemical reactions to examine.

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

My reasons for believing my results are reliable & accurate are
firstly, they agree with the theory behind the rate of photosynthesis
when light intensity is increased, secondly the result which I gained
compared accurately to my prediction, which was well thought out
before it was made, and finally the results I gained for my final
experiment differed so much to the results of my preliminary procedure
which was very inaccurate.

and at a certain light intensity the rate of photosynthesis stay ..

Rate of photosynthesis versus light intensity at different temperatures (2 factors)

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.

I can say that the
increase in distance thus making the light intensity stronger
increased the rate of photosynthesis and when further away made the
rate of photosynthesis almost come to its limiting factor the
straitening of the graph.

How light intensity effects the rate of photosynthesis ..

Rate of photosynthesis versus light intensity with different CO2/NaHCO3 concentrations (2 factors)


Input - Light intensityis to be varied by increasing and decreasing
the distance from the light source to the plant

Output - The rate of photosynthesisis to be measured by counting the
bubbles of oxygen produced by the plant every two minutes, and
therefore finding the rate of photosynthesis

Control - The amount of water available to the Elodea will stay the
same level in the 400 cm3 beaker.

So by level of light you probably mean lightintensity which is something that can be measured.Light intensity is usually defined as theenergy hitting an area over some time period.So in the case of a plant, a higher lightintensity means more packets of light called“photons” are hitting the leaves. As you rise fromlow light intensity to higher light intensity, therate of photosynthesis will increase because thereis more light available to drive the reactions ofphotosynthesis. However, once the light intensitygets high enough, the rate won’t increase anymorebecause there will other factors that are limitingthe rate of photosynthesis. A limiting factorcould be the amount of chlorophyll molecules thatare absorbing the light. At a very high intensityof light, the rate of photosynthesis would dropquickly as the light starts to damage the plant.

Rate of photosynthesis versus CO2/NaHCO3 concentrations at light intensities (2 factors)
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  • Rate of photosynthesis experimental method 1

    The lower the light intensity the slower the rate of photosynthesis and eventually it will decrease in l level.

  • the effect of light intensity on the rate of photosynthesis

    I am happy with the experiment as I proved that light intensity has an effect on the rate of photosynthesis.

  • light intensity on the rate of photosynthesis ..

    The aim of my experiment is to find out how light intensity affects the rate of photosynthesis

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How light intensity effects the rate of photosynthesis.

Though the lamp was
not necessarily very bright one day & extremely dim the next day of
the experiment, it could have made the difference of 10 or so
centimetres distance to the light intensity supplied to the pond weed.

Photosynthesis Science Fair Projects and Experiments

Therefore in graph (c) the horizontal axis could be also labelled relative light intensity, a proportional linear relationship with the rate of photosynthesis.

Primary Productivity & Dissolved Oxygen Lab - …

When the lights were shut off after 6 minutes, and the light was 50 cm away from the beaker, the number of disks floating constantly decreased.
1) How does light intensity affect the net rate of photosynthesis?
Sodium Bicarbonate (baking soda)
 Liquid soap
 Plastic syringe (10 cc or larger)
 Leaves (i.e.

LabBench Activity Dissolved Oxygen and Aquatic Primary Productivity

Diagram f

On considering my experiment, in hindsight, perhaps I would have
gained an even higher rate of photosynthesis if I had made the
temperature of the water slightly lower.

Photosynthetic Efficiencies of LEDs: Results of Short …

At a point (which was not
displayed on my graph, so logically this point is higher than the
highest light intensity I provided the pond weed with) the rate of
photosynthesis will stay steady , it will increase no further (see
diagram e).

Plan for an experiment - How does temperature affect …

This energy is used to produce ATP, to reduce NADP to NADPH and then used to incorporate carbon dioxide (CO2) into organic molecules in a process called carbon fixation
3) Null: Light intensity will not affect the net rate of photosynthesis
Hypothesis: If light intensity influences the rate of photosynthesis then the leaf disk exposed to greater intensities of light should produce more oxygen than leaf tissue exposed to lower intensities.
1) Label 4 cups with the following: CONTROL, 30 cm, 50 cm, 30 cm DARK
2) Mix 1/8th tspoon of baking soda and mix it in
300 ml of water in one of the beakers
3) Add a squirt of soap to the beaker and
add 200mL of water.

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