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A controlled experiment includes only one variable tested at a time.
controlled experiment
In an experiment testing the effect of fertilizer on plant growth, the independent variable is the amount of fertilizer used.
independent variable
The dependent variable is what is measured or observed, such as the plant's growth.
dependent variable
The group that does not receive the treatment is the control group.
control group
The group that does receive the treatment is the experimental group.
experimental group
Scientists record their observations and measurements as data.
data
A molecule that carries genetic information.
DNA
A process that helps plants make food from sunlight.
Photosynthesis
Maintains a stable internal environment.
Homeostasis
The process of cell division.
Mitosis
Controls what enters and exits the cell.
cell membrane
Directs cell activities and contains DNA.
Nucleus
Site of protein synthesis.
Ribosome
Produces energy (ATP) from food.
Mitochondria
Converts sunlight into energy in plant cells.
Chloroplast
Stores water and nutrients in plant cells.
Vacuole
