i. introduction
a. whenever data is collected, it is often presented in a meaningful way so that others can view and make sense of it. often the data will be presented in a ______________ or a ____________.
data tables are a way of ______________ the information. graphs are ____________________ that represent ____________________.
b. as a student, it is important that you master these essential skills:
1. interpreting and reading graphs
2. constructing data tables
3. constructing different types of graphs (line graphs, bar graphs, circle graphs)
4. critical thinking and problem solving
ii. interpreting graphs
a. study the line graph to the right and answer the following questions.
1. what information is being shown in this graph? ____________________
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2. describe the results shown for corn plants. ____________________
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3. describe the results shown for oak seedlings. ____________________
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4. describe the results shown for rose bushes. ____________________
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5. at what fertilizer concentration do oak seedlings stop improving? ____________________
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6. what was the height of the tallest plant used in this experiment? ____________________
7. for which plant is this fertilizer least effective at higher concentrations? ____________________
8. which plant shows the best growth when the fertilizer concentration is 100 mg/l? ____________________
9. predict how tall corn plants might be when the fertilizer concentration is 75 mg/l. ____________________
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10. consider the three types of plants used in this experiment. what reasons might explain why the results turned out as they did?
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Question

Accepted Answer

### Part I A
# Brief Explanations:
When data is collected, common ways to present it are a **data table** and a **graph**. Data tables organize information. Graphs are visual representations that show relationships (like between variables, here fertilizer and plant height).
# Answer:
1. data table; graph
2. organizing
3. visual representations; relationships (e.g., between fertilizer amount and plant height)

### Part II A (Graph Interpretation, assuming the line graph has x - axis: Fertilizer (mg/L), y - axis: Average Plant Height (cm), 3 lines: Corn, Oak, Rose)
1. **What information is being shown?**
# Brief Explanations:
The graph shows the relationship between fertilizer concentration (mg/L) and the average height (cm) of three plants: corn, oak seedlings, and rose bushes.
# Answer:
It shows how fertilizer concentration (mg/L) affects the average height (cm) of corn plants, oak seedlings, and rose bushes.

2. **Describe corn plants’ results**
# Brief Explanations:
Corn’s line (blue) rises steadily: as fertilizer increases (0–300 mg/L), average height increases (from ~5 cm to ~35 cm).
# Answer:
As fertilizer concentration increases (0–300 mg/L), the average height of corn plants increases steadily (e.g., from ~5 cm to ~35 cm).

3. **Describe oak seedlings’ results**
# Brief Explanations:
Oak’s line (red) rises to ~20–25 cm at ~150–200 mg/L, then decreases (e.g., to ~15 cm at 300 mg/L).
# Answer:
Oak seedlings’ average height increases with fertilizer up to ~150–200 mg/L (reaching ~20–25 cm), then decreases (e.g., to ~15 cm at 300 mg/L).

4. **Describe rose bushes’ results**
# Brief Explanations:
Rose’s line (green) drops: starting at ~25 cm (0 mg/L), height decreases as fertilizer increases (to ~0–5 cm at 300 mg/L).
# Answer:
The average height of rose bushes decreases as fertilizer concentration increases (from ~25 cm at 0 mg/L to ~0–5 cm at 300 mg/L).

5. **Fertilizer concentration oak stops improving**
# Brief Explanations:
Oak’s height peaks (stops increasing) around 150–200 mg/L (where the line stops rising and starts falling).
# Answer:
Around 150–200 mg/L (e.g., 150 mg/L or 200 mg/L, based on graph peaks).

6. **Tallest plant height**
# Brief Explanations:
Corn’s line reaches ~35 cm (highest y - value among the three plants).
# Answer:
~35 cm (from corn plant at 300 mg/L).

7. **Least effective fertilizer (higher concentrations) for which plant?**
# Brief Explanations:
Rose bushes: their height drops sharply with higher fertilizer (e.g., at 300 mg/L, height is very low), so fertilizer is least effective here.
# Answer:
Rose bushes (their height decreases significantly with higher fertilizer).

8. **Best growth at 100 mg/L?**
# Brief Explanations:
At 100 mg/L, compare y - values: Oak (red) is ~20 cm, Corn (blue) ~15 cm, Rose (green) ~15 cm. So oak seedlings.
# Answer:
Oak seedlings (highest height at 100 mg/L).

9. **Predict corn height at 75 mg/L**
# Brief Explanations:
Corn’s growth is linear (approximate). At 0 mg/L: ~5 cm; at 100 mg/L: ~15 cm. Slope = (15 - 5)/100 = 0.1 cm/mg/L. At 75 mg/L: 5 + (0.1 * 75) = 12.5 cm (approximate, based on linear trend).
# Answer:
~12.5 cm (or 10–15 cm, based on linear interpolation between 0 and 100 mg/L).

10. **Reasons for results**
# Brief Explanations:
Different plants have unique nutrient needs (e.g., corn thrives with fertilizer, rose is sensitive to high fertilizer, oak has an optimal range). Genetic differences, physiological tolerance to fertilizer, or ecological adaptations explain this.
# Answer:
Plants have different nutrient requirements/tolerances: Corn may need high fertilizer for growth; Rose is sensitive to high fertilizer (toxicity?); Oak has an optimal fertilizer range (beyond which growth declines). Genetic/physiological differences drive these responses.

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QUESTION IMAGE

Question

Explanation:

Part I A

Answer:

Part II A (Graph Interpretation, assuming the line graph has x - axis: Fertilizer (mg/L), y - axis: Average Plant Height (cm), 3 lines: Corn, Oak, Rose)