Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.
This lab has been created in order to find what extent does distance from a light source (5cm, 10cm, and 15cm) affect the rate of photosynthesis (measured in bubbles / 3 min) in Elodea water plants. Hypothesis: More amount of time under the light will cause the plant to give out more glucose and O2. Also, if the light is closer, the process will be faster. The procedure for this would be to leave the Elodea plant in water with sodium bicarbonate (baking soda increases carbon dioxide in water), set up the lamp at 5cm distance and start the timer for 3 minutes. Overall results are that after 9 minutes (3 minutes intervals between the light distance), the solution gave off 4 bubbles.
The following materials were required for the experiment:
A green sprig of Elodea
Sodium Bicarbonate (baking soda)
The following procedures were required for the experiment:
Obtain a green sprig of Elodea. Remove several leaves from around the cut and of the stem. Slice off a portion of the stem at an angle and lightly crush the cut end of the stem.
Place a small pinch of sodium bicarbonate into a test tube (this increases carbon dioxide in water)
Fill the test tube with distilled water so that the stem is completely submersed.
Place the plant into a beaker.
Place a source of light 5cm from plant.
Wait a minute
After one minute, count and record the number of oxygen bubbles rising from the cut end of the stem for 3 minutes. If bubbles fail to appear after one minute, repeat part A.
Run a second 3 minute trail at 10cm from light sources (lamp). Record results.
Run a third 3 minute trail with at a 15cm distance from a light