Photosynthesis in Elodea Lab Essay

602 Words 3 Pages
Elodea & Photosynthesis

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
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After 9 minutes (“more time under light source”), there were more bubbles than at the beginning. However, it was not due to the closeness of the lamp but to the amount of time under it. Also, the plant was heated up towards the end and it gave results, even though the distance between the plant and lamp was greater. Some possible mistakes that could have occurred during this experiment can include the following:
Miscalculating the distance between the Elodea plant and the light source.
Putting in too much water.
Putting in too much sodium bicarbonate.
Elodea plant may be dry or not developed.
Water may have been contaminated
Leaving the Elodea plant in too long or too little
Not cutting the Elodea plant correctly

Hypothesis is declined. It was not exact to the results given, therefore I marked it incorrect. My hypothesis was that after a bigger amount of time under the light, the plant will give out more glucose and O2. This part was correct, but not because “if the light is closer, the process will be faster”. It was only due to time, not distance. It is true that if we left the lamp in a position of 5cm distance, same result could have been given faster. Yet the experiment gave out the 3 minute interval rule. Correct hypothesis: More amount of time under the light will cause the plant to give out more glucose and O2.

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