Light Intensity and Photosynthesis
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Light Intensity and Photosynthesis
Investigation setup
A class investigates whether changing the distance between a lamp and pondweed affects the plant’s rate of photosynthesis. They place a fresh 9 cm piece of pondweed in a beaker containing sodium hydrogencarbonate solution, which supplies carbon dioxide. At each lamp distance, they wait three minutes, then count bubbles released in one minute. They repeat the count three times. The beaker, plant length, solution, lamp, and room conditions are kept the same. The class tests several lamp distances, as recorded in the results table.
Lamp distance (cm)
Trial 1
Trial 2
Trial 3
Mean bubbles per minute
12
43
47
45
Calculate
24
31
29
32
Calculate
36
19
21
20
Calculate
48
12
14
13
Calculate
60
5
7
6
Calculate
Variables and method
- The distance from the lamp to the beaker
- The number of bubbles counted
- The length of the pondweed
- The temperature of the solution
- It provides carbon dioxide for photosynthesis.
- It makes the lamp brighter.
- It absorbs all the oxygen bubbles.
- It keeps the pondweed from receiving light.
Read and interpret the results
- 12 cm
- 24 cm
- 48 cm
- 60 cm
- Independent variable
- Dependent variable
- Controlled variable
- Repeat trial
- Length of pondweed used
- Another one-minute count at the same distance
- Bubbles counted in one minute
- Lamp-to-beaker distance
4 printable pages
Page 1
Page 2
Page 3
Page 4
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