INTRODUCTION
CELL ORGANELLES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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one
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two
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three
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as many as possible
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Detailed explanation-1: -Yes, an experiment should test only one variable at a time. This ensures that the experimental outcome is clearly due to one identifiable factor.
Detailed explanation-2: -An experiment usually has three kinds of variables: independent, dependent, and controlled. The independent variable is the one that is changed by the scientist. To insure a fair test, a good experiment has only ONE independent variable.
Detailed explanation-3: -Independent Variables To ensure a fair test, a good experimental inquiry only has one independent variable and that variable should be something that can be measured quantitatively. For example, experimental inquiries about plants may include such independent variables as: Volume of water given to plants.
Detailed explanation-4: -The three main types of controls are positive, negative, and experimental controls. A positive control is something known to produce a positive result and will often be included (especially for diagnostic tests) to ensure that a negative result is not due to experimental or reaction failure.