Of course! Investigating the effect of different liquids on plant growth is a great science project that you can complete within 7 days using household items. Here are the steps to get started:

Materials:
- Four identical plants
- Four different liquids (such as water, sugar water, vinegar, and soda)
- Measuring cup
- Small containers (such as cups or jars)
- Labels or markers
- Notebook and pen

Procedure:
1. Label each container with the name of the liquid you will be using.
2. Measure out 1 cup of each liquid and pour it into its corresponding container.
3. Label each plant with the name of the liquid it will be receiving.
4. Water each plant with the corresponding liquid daily, making sure to water each plant with the same amount of liquid.
5. Observe and record the growth of each plant daily for 7 days.
6. At the end of the 7-day period, measure and record the height and number of leaves of each plant.

Analysis:
1. Compare the growth of each plant across the 7-day period.
2. Record any differences in height or number of leaves between the plants.
3. Draw conclusions about the effect of each liquid on plant growth.

This experiment can be modified by using different types of plants or liquids. It's a great way to learn about plant biology and how different liquids can impact plant growth. Good luck with your project!
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