A scientist formulates the following hypothesis: If plants of the same species are grown under the same conditions, the amount of fertilizer the plants receive will affect their growth rate. Which variable will be a controlled variable in the experiment designed to test this hypothesis? A. The amount of fertilizer each plant receives B. The amount of water given to each plant C. The height of each plant measured in centimeters D. The number of time each week the plants are measured

Question

A scientist formulates the following hypothesis: If plants of the same species are grown under the same conditions, the amount of fertilizer the plants receive will affect their growth rate. Which variable will be a controlled variable in the experiment designed to test this hypothesis? A. The amount of fertilizer each plant receives B. The amount of water given to each plant C. The height of each plant measured in centimeters D. The number of time each week the plants are measured

Answer 1

**Question:**Question 1 of 25A scientist formulates the following hypothesis: If plants of the same species are grown under the same conditions, the amount of fertilizer the plants receive will affect their growth rate. Which variable will be a controlled variable in the experiment designed to test this hypothesis?A. The amount of fertilizer each plant receivesB. The amount of water given to each plantC. The height of each plant measured in centimetersD. The number of times each week the plants are measured**Answer:**【Explanation】: In the given hypothesis, the scientist is investigating the impact of fertilizer amount on the growth rate of plants of the same species under consistent conditions. Controlled variables are factors that need to be kept constant to ensure that any observed differences in growth rate are solely attributed to the independent variable, which, in this case, is the amount of fertilizer.- Option A, "The amount of fertilizer each plant receives", is the independent variable under scrutiny. It is what the scientist is manipulating to observe its effect on plant growth.- Option B, "The amount of water given to each plant", is a controlled variable. It must remain constant throughout the experiment to isolate the influence of fertilizer on plant growth, ensuring that any differences are not due to varying water amounts.- Option C, "The height of each plant measured in centimeters", is the dependent variable. It represents the outcome being measured as a response to the changes in fertilizer amount.- Option D, "The number of times each week the plants are measured", is a procedural aspect of the experiment and not a variable.**Answer: B**