An experiment was designed to determine the effect of nitrates on plant growth two groups of plants are grown under identical conditions except one group is watered with a dilute nitrate solution in the other group received water without nitrates in this investigation the good will plants grow without added nitrates is known as the

An experiment was designed to determine the effect of nitrates on plant growth. Two groups of plants were grown under identical conditions, except one group was watered with a dilute nitrate solution and the other group received water without nitrates. In this investigation, the group of plants grown without added nitrates is known as the
A. abiotic factor
B. control
C. variable
D. environmental stimulus

The correct answer is B. Control

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