1.What variable has a direct effect on the experimental group of plants?
2.What variables were remained constant or in the same amount in all plant set –ups?
3.What is the main variable of this observation that responds to change?
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Answer:
1.The variable that affects the dependent variable is called the independent variable. In the plant experiment, the independent variable could be fertilizer—some plants will get fertilizer, others will not.
2.control variable
a control variable is what is kept the same throughout the experiment, and it is not of primary concern in the experimental outcome.
3.The changes in an experiment are made to the independent variable (also called the manipulated variable); the responses that happen as a result of those deliberate changes are the responding variables. For example, let's say you were investigating how light affects plant growth