Page 28 - Science Course 1 (Book 1)

Mo. 1 - L3a How Do We Conduct Science Mo. 1 - L3a How Do We Conduct Science
Experiment? Experiment?

Scientists use scientific inquiry to investigate the use
of protists to make biodiesel. The constant, or control, is the
factor that stays the same in
the experiment

Example: The plant used,
BIODIESEL
pot size, amount of liquid,
soil, type, etc.

In addition to growing microalgae for biodiesel
production, there are other benefits of growing
microalgae.
They design controlled
experiments to test their Not only do microalgae produce a valuable fuel, they
hypotheses. also remove pollutants from and add oxygen to the
atmosphere.
A controlled experiment is Sunlight
a scientific investigation
that tests how one Jet
variable affects another. CO2 CO2
CO2
A variable is any factor in an experiment that can have
more than one value. Euglena Farm
Human Life Biofuel
In controlled experiments, there are two types of
variables: Dependent variables and Independent
variables
Scientific Variable Mnemonic Device / Sound
Controlled Variable Controlled variable stay
constant
Independent Variable I, the scientist, only change Food & Euglena Powder Feed
this Drinks
Dependent Variable The Dependent variable is Key Concept
you Data
How Do We Conduct Science Experiments?
How do independent and dependent variables
differ?
The dependent variable is the
factor measured or observed
during an experiment.

Example: The height or health of
the plant.

The independent variable is
the factor that you want to test.
It is changed by the
investigator to observe how it
affects a dependent variable.

Example: The liquid used to water
each plant.

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