Question

Which statement describes an experimental procedure that is properly controlled? OA. Twenty mice are fed a diet high in protein and their weights are measured every day for six weeks. OB. One hundred watermelon seeds are planted in full sunlight, while 100 pumpkin seeds are planted in partial sunlight. OC. Fifteen tomato plants are given 5 mL of a saltwater solution every day, another 15 tomato plants are given 5 mL of plain water, and each plant's growth is measured each week. OD. A survey shows the 10 best action movies made in the past five years.​

Answer 1

Answer:The experimental procedure that is properly controlled is option C.

In this experimental procedure, two groups of tomato plants are used, with one group receiving the saltwater solution and the other receiving plain water. This allows for a comparison between the two groups to determine whether the saltwater solution has an effect on the growth of the tomato plants.

Additionally, each plant's growth is measured each week, which allows for a quantitative analysis of the data. By measuring the growth of each plant in both groups, the experimenter can control for variables such as soil quality, sunlight exposure, and water availability, and attribute any differences in growth to the variable being tested (the saltwater solution).

In contrast, the other options (A, B, and D) either do not have a control group or do not manipulate a specific variable while controlling for other variables, making it difficult to draw conclusions about causation.

Step-by-step explanation:

Answer 2

C

Step-by-step explanation: