7th Grade Science Worksheets PDF: Complete with ease | airSlate ... - Free Printable

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I’ll solve and explain each section based on the content you pasted.

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## ✔ I. SCIENTIFIC METHOD

This section defines key steps in the scientific method:

1. PROBLEM – always in the form of a *question*.
→ Example: “Does sunlight affect plant growth?”

2. HYPOTHESIS – an educated guess (possibly answer to the problem).
→ Example: “If plants receive more sunlight, then they will grow taller.”

3. EXPERIMENT – 3 parts:
- Control: constant variable (stays the same)
- Independent variable: what you change
- Dependent variable: what you measure

4. OBSERVATIONS – analyze data, charts, graphs…
→ This is where you collect qualitative or quantitative data during your experiment.

5. CONCLUSION – 3-part summary:
- Did your hypothesis support or reject the results?
- What did you learn?
- How could you improve the experiment?

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## ✔ II. DEFINE THE FOLLOWING TERMS

1. CONTROL – used as a comparison in the experiment; does NOT get the independent variable.
→ Example: In a plant growth experiment, the control group might get no fertilizer, while others get different amounts.

2. INDEPENDENT VARIABLE – experimental factor.
→ The one thing you deliberately change to test its effect.
→ Example: Amount of water given to plants.

3. DEPENDENT VARIABLE – what is being measured in the experiment (e.g., height of plant).
→ It depends on the independent variable.
→ Example: Plant height after 2 weeks.

4. Example: A student set up an experiment to learn about plant growth. She added a different amount of water to 3 identical containers, each containing 5 seeds in 100 g of soil. All containers were placed in the same sunny location. The height of the plants were measured and recorded for 3 weeks.

Now answer the questions:

> a. State a hypothesis for this experiment.

✔ Answer:
*If plants are given different amounts of water, then their growth (height) will vary.*

> b. Independent variable = ______

✔ Answer:
Amount of water

> c. Dependent variable = ______

✔ Answer:
Height of plants

> d. Identify the factors that must remain constant in this experiment.

✔ Answer:
- Type of seeds
- Amount of soil (100g per container)
- Sunlight exposure (same sunny location)
- Container type
- Duration of experiment (3 weeks)
- Temperature (assumed same since same location)
→ These are the controlled variables.

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## ✔ III. REVIEW QUESTIONS

> 1. The first step in the scientific method is:
> a. state the hypothesis
> b. state the problem
> c. experiment
> d. observation

✔ Answer: b. state the problem
→ You start by asking a question or identifying a problem to investigate.

> 2. What is one factor in an experiment that remains constant?

✔ Answer: Controlled variable (or simply “control”)
→ This is something kept the same across all groups to ensure a fair test.

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## 📌 Summary of Key Concepts:

| Term | Definition |
|----------------------|----------------------------------------------------------------------------|
| Problem | Question you want to answer |
| Hypothesis | Educated guess (If...then...) |
| Independent Variable | What you change |
| Dependent Variable | What you measure (result) |
| Control | Group that doesn’t get the treatment; used for comparison |
| Controlled Variables | Factors kept constant to avoid affecting results |

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✔ Final Tips for Students:
- Always write your hypothesis as an “If...then...” statement.
- Label your variables clearly before starting the experiment.
- Keep everything else the same except the independent variable — that’s how you know what caused the change!

Let me know if you’d like me to create a sample lab report using this example or turn this into a printable worksheet! 🌱🔬