Science Graphing Practice Worksheet | efarmers.ng - Free Printable

You're looking at a graphing worksheet for Life Science, designed for ESL/ELL students, focused on making and interpreting line graphs. The main task is in the left section: “Effect of Growth Hormone on Plant Height.” Let’s solve it step by step.

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## 🌱 PART 1: GRAPHING THE DATA

Given Data Table:

| Hormone Solution (mL) | Plant Height at 2 Weeks (cm) |
|------------------------|------------------------------|
| 0 | 11.5 |
| 5 | 15.5 |
| 10 | 20.0 |
| 15 | 28.5 |
| 20 | 31.0 |

Step-by-Step Graphing Instructions:

1. Label the Axes:
- X-axis (horizontal): Hormone Solution (mL) → This is the independent variable (what you change).
- Y-axis (vertical): Plant Height (cm) → This is the dependent variable (what you measure).

2. Scale the Axes:
- X-axis: Mark intervals of 5 mL from 0 to 20.
- Y-axis: Mark intervals of 2 cm or 4 cm from 0 to 32 (since max height is 31 cm).

3. Plot the Points:
- (0, 11.5)
- (5, 15.5)
- (10, 20.0)
- (15, 28.5)
- (20, 31.0)

4. Connect the Dots: Draw a smooth line connecting the points — this is a line graph showing how plant height changes with hormone amount.

> ✔ *Tip: Use a ruler to make straight lines between points if required, but since it's biological data, slight curves are acceptable.*

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## ❓ PART 2: ANSWERING THE QUESTIONS

1. What is the independent variable?

> Answer: Hormone Solution (mL)
> *Explanation:* This is the variable the scientist controls or changes — the amount of growth hormone applied.

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2. What is the likely plant height at 8 mL of hormone solution?

> Answer: ~17.5 cm *(approximate)*
> *Explanation:* Since 8 mL is between 5 mL (15.5 cm) and 10 mL (20.0 cm), we can estimate using interpolation:
> - Difference between 5 and 10 mL = 5 mL → height increases by 4.5 cm (from 15.5 to 20.0)
> - So per mL: 4.5 cm / 5 mL = 0.9 cm/mL
> - From 5 mL to 8 mL = +3 mL → 3 × 0.9 = 2.7 cm added to 15.5 → 18.2 cm
>
> But visually on the graph, it’s closer to ~17.5–18 cm. Either is acceptable for estimation.

> 🔍 *Note: If you’re plotting accurately, draw a vertical line from 8 mL up to the graph line, then horizontal to Y-axis — that gives your answer.*

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3. What is the plant height at 20 mL?

> Answer: 31.0 cm
> *Explanation:* Directly from the table — no estimation needed!

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4. Make a claim (conclusion) based on this graph.

> Answer Example:
> *“As the amount of growth hormone increases, the plant height also increases. This suggests that growth hormone stimulates plant growth.”*

> 💡 *Stronger Claim (with reasoning):*
> *“The data shows a positive correlation between hormone concentration and plant height. At 20 mL of hormone, plants grew over 2.5 times taller than those with no hormone, supporting the hypothesis that growth hormone promotes plant growth.”*

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## 🧠 BONUS: WHY THIS MATTERS IN SCIENCE

- Scientists use graphs to visualize relationships between variables.
- Line graphs show trends over continuous variables (like time or concentration).
- Identifying independent vs. dependent variables helps design experiments correctly.

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## ✔ FINAL CHECKLIST

✔️ Graph plotted with correct axes and labels
✔️ All 5 data points plotted accurately
✔️ Line drawn connecting points
✔️ Answers to all 4 questions completed with reasoning

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## 🎯 TEACHER’S KEY (For Reference):

1. Independent Variable: Hormone Solution (mL)
2. Plant height at 8 mL: ~17.5–18.5 cm (acceptable range)
3. Plant height at 20 mL: 31.0 cm
4. Claim: Growth hormone increases plant height; more hormone = taller plants (up to 20 mL).

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Let me know if you want help drawing the actual graph or need printable keys! 😊🌱

© The Biology Bar 2022 — Great resource for visual learners and ELL students!