Question

a gardener wants to test if using organic fertilizer makes tomato plants grow taller. she plants 10 tomato plants with organic fertilizer and 10 without any fertilizer.

• what is the independent variable?

• what is the dependent variable?

• name two constants

• what would be a good hypothesis?

Explanation:

The independent variable is what's changed (fertilizer use). Dependent is what's measured (plant height). Constants could be plant type and number of plants. Hypothesis predicts relationship.

Answer:

• Independent variable: Use of organic fertilizer
• Dependent variable: Height of tomato plants
• Two constants: Type of tomato plants, number of plants (10 per group)
• Good hypothesis: Tomato plants with organic fertilizer will grow taller than those without.