Materials
3 tomato seedlings of equal size
3 desk lamps with colored bulbs (red, blue, white)
Ruler
Watering can
3 identical pots with potting soil
Procedure
1. Plant one tomato seedling in each pot with identical soil.
2. Place each pot under a different colored light (red, blue, white control).
3. Water each plant with 50ml of water every 2 days.
4. Measure plant height daily for 14 days.
5. Record leaf count and overall appearance at day 7 and day 14.
Observations
Used tomato seedlings instead of beans. Blue light plant grew tallest at 14cm. White light was close at 13cm. Red light was 9cm but appeared stockier. Leaf counts: blue 5, white 7, red 4. Results generally consistent with the original investigation's findings, though tomatoes grew more slowly overall than reported for beans.
Notes
Replicated with tomato seedlings to see if the pattern holds across species. Blue light advantage persisted. The slower growth rate compared to beans is expected — tomatoes are slower growers at the seedling stage.