Question

1. the picture shows a test for non - slip surfaces to be used on a ramp. which of these must be done to provide more meaningful results? a. use the same shoe on each surface b. use boards of the same thickness c. use the same shoe size for each type of shoe d. use shoes with soles designed for sports 8. this experiment was set up to test the hypothesis that plants grow faster in green light. the same amount of water and fertilizer were added to each pot. which of these would improve the experiment? a. use green lights for all three plants b. add more types of plants c. use the same kind of plant in all trials d. use different pots for each plant

Explanation:

Step1: Analyze question 7

In an experiment testing non - slip surfaces, to get meaningful results, we need to control variables. Using the same shoe on each surface ensures that the variable of the shoe's properties (like sole texture, shape etc.) doesn't affect the result. Other options don't control the most relevant variable.

Step2: Analyze question 8

In an experiment testing plant growth under different light colors, using the same kind of plant in all trials controls the variable of plant type. Different plant types may have different growth rates regardless of light color. Other options don't improve the experiment in terms of controlling the key variable.

Answer:

1. A. Use the same shoe on each surface
2. C. Use the same kind of plant in all trials