Photosynthesis Lab

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Alyssa Wright


AIM: to investigate the effect of light intensity (lux) on the amount of oxygen produced (number of bubbles)

HYPOTHESIS: I predict that the rate of oxygen produced increases, as the light intensity increases, but only to a point. I predict this will happen because the plant will have enough carbon dioxide and water to keep up with the amount of light that there is. When there is less light intensity, photosynthesis will happen at a slower rate because gradually there will not be enough sunlight as there is carbon dioxide and water.

APPARATUS: lamp x 1
beaker x 1 (1L)
test tube x1(up to the top)
water 500ml(up to the top)
measuring stick ( to measure distance between light and plant) x1
Elodea plant x1
Safety goggles x5
Lab Quest Vernier (measuring light intensity) x1
stopwatch x1
bunsen burner x1
Tripod x1
Gauze x1
Thermometer x1
tape x one roll



1. Set up all the materials
Plug in lamp, place tape markers for each of the distances, turn on bunsen burner placed under a tripod and gauze, put the plant in a test tube and fill it up with water, place the test tube inside a beaker full of water 2.Turn the bunsen burner on

3.Put the thermometer inside the test tube and wait until the water is 30 degrees celsius 4.Take the beaker with the test tube inside it, off of the tripod and place it on the first tape marker (1cm) which is right against the lamp 5. Record the light intensity by placing the rod of the Lab Quest Vernier right next to the test tube


Number of Bubbles Produced with Different Distances from the Light Source



We found out that as the light intensity decreased, the rate of photosynthesis, or the number of...
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