Question

select the correct answer.

sarah performs an experiment to determine the effect of nitrogen on plants. she studies the effect of nitrogen on the growth of the root hair, height of the plants, and nodule formation. which factor is an independent variable?

amount of nitrogen
growth of root hair
nodule formation
height of the plants

Explanation:

Identify the experimental goal

The experiment investigates the effect of nitrogen on plant growth.

Define independent variable

The independent variable is manipulated by the researcher.

Analyze the measured outcomes

Root hair growth, plant height, and nodule formation are measured outcomes.

Determine the manipulated factor

The amount of nitrogen is the factor being changed.

Select the correct option

The independent variable is the amount of nitrogen.

Answer:

• amount of nitrogen (Correct answer)
• growth of root hair
• nodule formation
• height of the plants