Photosynthesis Investigation Worksheet
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Photosynthesis Investigation Worksheet
Method and fair testing
The class placed the same pondweed sprig in water containing sodium bicarbonate. They measured the number of bubbles released in one minute when the lamp was 10, 20, 30, 40, and 50 cm from the beaker. At each distance, they let the plant adjust for one minute and completed three one-minute trials. They kept the plant, water volume, bicarbonate concentration, timing, and room conditions the same. The lamp was the only factor they deliberately changed.
Position (cm)
Trial 1
Trial 2
Trial 3
Average
10 cm
40
38
42
40
20 cm
30
32
31
31
30 cm
22
24
23
23
40 cm
16
15
17
16
50 cm
10
12
11
11
Analyse the investigation
Use the method and results table to support your answers. Explain your thinking where asked.
- Lamp distance
- Plant size
- Water volume
3 printable pages
Page 1
Page 2
Page 3
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