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Which of the following describes a properly controlled experiment?

AThe weight of fifteen turtles is determined every day for three weeks.
BTwenty mice are given orange juice, while twenty plants are given water.
CA debate is held to determine the greatest artist who ever lived.
DFive radish plants are grown in sunlight, while another five radish plants are kept in the dark.

Verified Answer :

D. Five radish plants are grown in sunlight, while another five radish plants are kept in the dark. 

Scientific method is a process that is ongoing. Based on the observations via properly done experiments, a scientist can come to a proper conclusion. Although the procedures followed during experiment may vary, but the final result should always be the same

Answer:

Option D, Five radish plants are grown in sunlight, while another five radish plants are kept in the dark.

Explanation:

In a controlled experiment, impact of one independent variable is studied on the dependent variable.  

Here in this study sunlight is the independent variable while the radish plant is dependent variable.  

The researcher wants to study the effect of sunlight on radish plants when they are exposed to it   and compare it to the effect created on radish plants  that are kept in dark.  

Hence option D is correct.

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