Katherine wants to investigate if the time of day a plant is watered affects the growth of the plant. She waters different plant varieties with the same amount of water at different times in the day. The plants are sitting in the same location and get the same amount of sunlight. Which variable is missing from the experiment?

Independent variable; plants should be watered at different times of the day
Controlled variable; experiment should use the same types of plants
Dependent variable; the amount of sunlight should change daily
Controlled variable; experiment should use the same amount of water

It goes without saying that Katherine wants to find out if the time of day a plant is watered impacts its growth. She waters various plant species with the same quantity of water at various intervals throughout the day. The plants receive the same amount of sunshine and are situated in the same spot.

Plants should be watered at various times of the day, an independent variable.

Controlled variable; identical plant species should be used in the experiment

Sunlight intensity is a dependent variable that should fluctuate everyday.

Controlled variable; identical water volume should be used in the experiment

From above we can conclude that missing variable is that the amount of sunlight should change daily.

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