Question

experimental design quiz
highlight the control group.
pea plant clones are given different amounts of water for a three - week period. first pea plant receives 400 milliliters. second pea plant receives 200 milliliters. third pea plant receives 100 milliliters. fourth pea plant does not receive any extra water; the plant only receives natural ways of receiving water. the height of the pea plants is recorded daily.

Explanation:

In an experimental design, the control group is the one that is not subjected to the independent variable (here, the manipulated amount of extra water). The fourth pea plant only receives water naturally, without any extra water added, so it serves as the control to compare with the plants that got extra water.

Answer:

Fourth pea plant (the one that does not receive any extra water, only receives natural ways of receiving water)