📊 Part 1: Identify the Variables - Answer Key

Independent Variable: Amount of water (1, 2, or 3 cups daily)

Dependent Variable: Plant growth (height, number of leaves, etc.)

Constants: Type of plant, amount of sunlight, type of soil, temperature, time period

Independent Variable: Type of music (classical, rock, pop, or no music)

Dependent Variable: Speed of solving math problems (time taken)

Constants: Same math problems, same people, same room conditions, same time of day

Independent Variable: Temperature of water

Dependent Variable: Speed of sugar dissolving (time it takes)

Constants: Amount of sugar, amount of water, type of sugar, stirring method

🎯 Part 2: Multiple Choice - Answer Key

Answer: C) Type or amount of fertilizer

Answer: B) Constants (controlled variables)

Answer: A) Dependent variable

Answer: C) To make sure only one thing is being tested at a time

Answer: B) The age of the people being tested

🔬 Part 3: Design Your Experiment - Grading Notes

Answers will vary. Look for the following elements in student responses:

✓ Clear research question - Should be testable and specific

✓ Correctly identified independent variable - What the student will change/control

✓ Correctly identified dependent variable - What the student will measure/observe

✓ At least 3 appropriate constants listed - Variables that will be kept the same

✓ Realistic and safe experimental design - Appropriate for grade 6 level

Common topics students might choose: plant growth, paper airplane flight, ice melting, battery life, etc.