# Experiment on the Effect of Light Intensity of Plants Growth

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• Published : September 14, 2013

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The Effect of Water on Germination and Plant Growth in Marigolds

Question: How does the amount of water given to a plant affect how much it grows?

Hypothesis: If I give water to a marigold seed then it will germinate and the plant will grow more than a seed not given water.

Independent Variable (IV): the amount of water given a seed/plant

Dependent Variable (DV): the amount of plant growth

Control Group: The group of plants given water

Experimental Group: The group of plants given no water

Constants: amount of sunlight, the amount of soil, the temperature, the amount of fertilizer, the size of the pot, the type of plant, the number of plants, the age of the plants.

Materials:
• 20 plant seeds (marigolds)
• 20 - 3” pots
• Pen/Marker
• Potting soil
• Measuring cups/spoons
• Plant fertilizer
• Spoon
• Water

Procedure:
1. Gather materials.
2. Using tape and pen, label each pot 1-20.
3. 1-10 pots are the Control group and 11-20 pots are the Experimental group. 4. Place 1 cup of soil in each pot.
5. Place 1 tsp of fertilizer in each pot.
6. Using spoon, mix fertilizer in soil until evenly distributed. 7. Make small indentation in soil, approximately 2 cm deep. 8. Place one seed in each indentation in pot.
9. Lightly cover over seed with soil from pot.
10. Add 20 ml of water to 25 pots labeled “Control”. Do NOT add any water to 25 pots labeled “Experimental”. 11. Place all pots on windowsill.
12. Make data table for data.
13. Everyday at the same time record observations of plants/growth. 14. Everyday at the same time add 20 ml of water to 25 pots labeled “Control”. Do NOT add any water to 25 pots labeled “Experimental” 15. After 14 days, measure the height of each plant and record in data table. 16. After 14 days, average the growth for each group of plants (Control and Experimental). 17. Graph results.

18. Draw conclusions.
19. Write formal lab report.
20. Clean up and put away all materials.

Observations and Data:

Observations:
Day 1 – no growth
Day 2 – no growth
Day 3 – 5 of 10 control plants and 1 of 10 experimental plants showed growth. Day 4 – 6 of 10 control plants and 1 of 10 experimental plants showed growth. Control group plants are growing faster than Experimental group. Day 5 – 7 of 10 control plants and 2 of 10 experimental plants showed growth. Running short of time and spilled a little of the water given to plant 7 in the control group today, not much though. Day 6 – 8 of 10 control plants and 2 of 10 experimental plants showed growth. Day 7 – 8 of 10 control plants and 2 of 10 experimental plants showed growth. Day 8 – 8 of 10 control plants and 3 of 10 experimental plants showed growth. Day 9 – 8 of 10 control plants and 3 of 10 experimental plants showed growth. Day 10 – No more plants have germinated. The control group plants look greener than the experimental group. Day 11 – The control group plants look greener than the experimental group. Day 12 – The control group plants look greener than the experimental group. Plant #14 doesn’t look like it has grown recently and is turning brown. Day 13 – The control group plants look greener than the experimental group. Plant # 13 is browner today than yesterday. Day 14 – The control group plants look greener than the experimental group. Only Plant #17 of the experimental group still has some green on it.

Data Table: Plant growth (cm)
| |Control Group |Experimental Group | | |1 |2 |

Results:
As the amount of water given to the plants increases the amount of plant growth increases.

Graph:The effect of water...