SME
Grade 7 Science · Problem type
Oxygen bubbles from a water plant
Use this to record how many bubbles a water plant gives off each minute at each lamp distance.
Record and look
32
20
12
7
0
Lamp at 10 cm
20 cm
30 cm
40 cm
Dark
Lamp at 10 cm
20 cm
30 cm
40 cm
Dark
Bubbles in a minute (bubbles)
32
20
12
7
0
The plant made 32 bubbles a minute close to the lamp and none in the dark.
More light, more photosynthesis, more oxygen.
Tap a bar at the height you want.
Assumptions
•
Put a sprig of Elodea under water in a beaker with a lamp beside it. Keep the lamp away from the water.
•
The bubbles are oxygen from photosynthesis.
•
Count for one minute at each distance, then with the lamp off.
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