1. Problem/Question: Sarah observes the small garden in their house. She ask her mother why are the plants needed water but it has fertilized already. Their plants aren’t grow . So she decided to experiment on what is the effect of watering on plant growth.
2. Observation/Research: She water them every day, they have good soil, and they're in the shade.
3. Formulate a Hypothesis: Sarah think plants will grow better if they're in the sun, than in the shade. The greater the amount of water, the faster the growth.
4. Independent variable : The independent variable in this science fair project is the amount of water used every day– 20ml, 40ml, 60ml, 80ml and 100ml once a day or twice a day.
5. Constant Variable: The constants (control variables) are the environment that the plants are kept in (temperature, humidity, light, etc), the species of plant used, the size of the pot and the type of soil.
6. Trials: Sarah is going to test ten pots with the same amount of soil , and place ten mung beans in each pot. followed by one of the following measurement: 20 ml, 40 ml, 60 ml, 80 ml or 100 ml of water.
7. Collect and Analyze Results:
Number of times watered per day Effect of different amount of water on the height of mung beans growth (mm) Number of times watered per day| Effect of different amount of water on the height of mung beans growth (mm)| | 20 ml| 40 ml| 60 ml| 80 ml| 100 ml|
Once| 305| 365| 415| 435| 395|
Twice| 425| 465| 415| 160| 85|
As the amount of water increased in the plant, the overall change in the height of the plant increased. This suggests a positive correlation. Plants require sunlight, water and carbon dioxide to grow. These are necessary in the process of photosynthesis, which makes glucose for the plants. The glucose is then used by the plant in the process of cellular respiration in order to make energy.