Question

marcella has read an article on the internet that says plants grow better in acidic soil. she decides to test this statement by adding 15 milliliters of vinegar to the 0.5 l water container she uses to water one row of her marigolds. on the other row, she waters her marigolds with regular water from a 0.5 l container. she measures her marigold’s height each week for six weeks. 3. the control group: a) the marigolds treated with vinegar + water b) the amount of water used on the plants c) the marigolds watered with pure water d) the length of time the marigolds are measured

Explanation:

In an experiment, the control group is the group that does not receive the experimental treatment. Here, marigolds watered with pure water are not getting the acidic - water treatment, serving as the baseline for comparison.

Answer:

c) the marigolds watered with pure water