Let's go through each experiment and identify the
independent variable (IV),
dependent variable (DV), and
control. Remember:
-
Independent Variable (IV): The factor that is deliberately changed or manipulated by the experimenter.
-
Dependent Variable (DV): The outcome that is measured or observed in response to the change.
-
Control: The standard or baseline condition that remains unchanged to provide a comparison.
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1. Bean Growth Experiment
> One bean was watered with Coca-Cola, one with lemonade, and one with just water. After a week, she measured how high they had grown.
a.
Independent Variable (IV):
Type of liquid used (Coca-Cola, lemonade, water)
b.
Dependent Variable (DV):
Height of the beans (how much they grew)
c.
Control:
The bean watered with just water — this is the normal condition, so it serves as the baseline for comparison.
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2. Marigold Fertilizer Experiment
> Jason tested three marigolds: one with Miracle Grow, one with Scotts fertilizer, and one with no fertilizer.
a.
Independent Variable (IV):
Type of fertilizer used (Miracle Grow, Scotts, none)
b.
Dependent Variable (DV):
Growth of the marigolds (e.g., height, number of flowers, etc.)
c.
Control:
The plant with no fertilizer — this is the baseline to compare against the fertilized plants.
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3. Apple Eating and Grades Experiment
> Shania ate different numbers of apples each day and recorded her science grades.
a.
Independent Variable (IV):
Number of apples eaten per day
b.
Dependent Variable (DV):
Science grades (the outcome being measured)
c.
Control:
No control group is clearly defined here. However, the
day with zero apples (Day 1) can be considered the baseline or control condition, since it’s the starting point before any apples were consumed.
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4. Music and Basketball Performance
> Reekwon tested music types: no music, rap music, classical music, and counted baskets made.
a.
Independent Variable (IV):
Type of music played (no music, rap, classical)
b.
Dependent Variable (DV):
Number of baskets made in 10 minutes
c.
Control:
The day with no music — this is the baseline condition where no experimental treatment (music) is applied.
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✔ Final Answers:
####
1. Bean Growth
- a. IV: Type of liquid (Coca-Cola, lemonade, water)
- b. DV: Height of the beans
- c. Control: Water only
####
2. Marigold Fertilizer
- a. IV: Type of fertilizer (Miracle Grow, Scotts, none)
- b. DV: Growth of marigolds
- c. Control: No fertilizer
####
3. Apples and Grades
- a. IV: Number of apples eaten
- b. DV: Science grades
- c. Control: Day 1 (no apples)
####
4. Music and Baskets
- a. IV: Type of music (no music, rap, classical)
- b. DV: Number of baskets made
- c. Control: No music
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Parent Tip: Review the logic above to help your child master the concept of variables worksheet science.
