Science worksheet designed to help students practice identifying the independent variable, dependent variable, and control groups in various experimental scenarios.

Let's go through each experiment and identify the Independent Variable (IV), Dependent Variable (DV), Control, and Constants where applicable.

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1. Katiana’s Bean Experiment

Scenario: Katiana tested different liquids (Coca-Cola, lemonade, water) to see which helped beans grow best. She measured height after one week.

- a. Independent Variable (IV):
Type of liquid used to water the beans
*(This is what she changed: Coca-Cola, lemonade, water)*

- b. Dependent Variable (DV):
Height of the bean plants
*(This is what she measured as the outcome)*

- c. Control:
The plant watered with just water
*(Water is the standard or normal condition; it serves as a baseline for comparison)*

> *Note:* Constants include: amount of liquid, type of beans, amount of sunlight, soil type, pot size, etc. (not asked here, but implied)

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2. Trevor’s Marigold Fertilizer Experiment

Scenario: Trevor tested three fertilizers: Miracle Grow, Scotts, and no fertilizer.

- a. Independent Variable (IV):
Type of fertilizer used
*(Miracle Grow, Scotts, or none)*

- b. Dependent Variable (DV):
Growth of marigolds (e.g., height or health)
*(What he measured to determine effectiveness)*

- c. Control:
The marigold with no fertilizer
*(This group shows natural growth without any treatment)*

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3. Taylor’s Apple and Grades Experiment

Scenario: Taylor ate increasing numbers of apples over four days and recorded her science grades.

- a. Independent Variable (IV):
Number of apples eaten per day
*(She changed this each day: 0, 1, 2, 3 apples)*

- b. Dependent Variable (DV):
Science grades
*(This is what was being affected or measured)*

- c. Control:
Day 1 (no apples eaten)
*(This is the baseline condition with no intervention)*

> *Note:* Other constants might include time of day, amount of homework, teacher, etc., but not explicitly mentioned.

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4. CJ’s Music and Basketball Baskets Experiment

Scenario: CJ tested whether music affects basketball performance by playing no music, rap, and classical music.

- a. Independent Variable (IV):
Type of music played
*(No music, rap, classical)*

- b. Dependent Variable (DV):
Number of baskets made in 10 minutes
*(The outcome being measured)*

- c. Control:
Day 1 (no music played)
*(This is the baseline condition — no music, so it can be compared to others)*

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5. Michael’s Kitchen Cleaner Experiment

Scenario: Michael tested Lysol, Clorox, Pinesol, and water on grape juice stains.

- a. Independent Variable (IV):
Type of kitchen cleaner used
*(Lysol, Clorox, Pinesol, or water)*

- b. Dependent Variable (DV):
Effectiveness of cleaning (e.g., how well the stain was removed)
*(This is what he observed or measured — likely cleanliness or stain removal)*

- c. Control:
The counter cleaned with just water
*(This is the baseline condition with no chemical cleaner)*

- d. Constants:
Amount of grape juice (5 mL), same paper towel, same wiping method, same surface, same amount of cleaner sprayed, same conditions (light, temperature, etc.)
*(These are kept the same across all trials to ensure fair testing)*

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✔ Final Answers:

#### 1. Katiana’s Beans
- IV: Type of liquid (Coca-Cola, lemonade, water)
- DV: Height of bean plants
- Control: Water

#### 2. Trevor’s Marigolds
- IV: Type of fertilizer (Miracle Grow, Scotts, none)
- DV: Growth of marigolds
- Control: No fertilizer

#### 3. Taylor’s Apples
- IV: Number of apples eaten per day
- DV: Science grades
- Control: Day 1 (no apples)

#### 4. CJ’s Music & Baskets
- IV: Type of music (none, rap, classical)
- DV: Number of baskets made
- Control: No music

#### 5. Michael’s Cleaners
- IV: Type of cleaner (Lysol, Clorox, Pinesol, water)
- DV: Cleaning effectiveness (stain removal)
- Control: Water
- Constants: Amount of grape juice (5 mL), same paper towel, same wiping method, same surface, same amount of cleaner applied

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✔ Key Definitions Recap:
- Independent Variable (IV): What you change.
- Dependent Variable (DV): What you measure.
- Control: The normal/standard condition (usually "no treatment" or baseline).
- Constants: Everything else that stays the same to keep the test fair.

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