Question

You want to test the effect of sucralose on the growth of a plant. Design a study using the steps of the scientific method. What are the dependent and independent variables in this experiment?

Answer 1

Answers may vary. Here’s one possible answer:

The scientific method design will consist of these steps:

Make observations: A sugar substitute was detected in the environment where the plant lives. Earlier studies have shown that the sugar substitute affects energy production in plants.

Ask questions: Would plants grow if the water contained the sugar substitute?

Construct a hypothesis and make predictions: Plants that are given plain water will grow taller than plants given water containing the sugar substitute.

Test the hypothesis: In the experiment, the independent variable will be the type of water the plants receive. The dependent variable will be the growth of the plant. Use two identical plants for the experiment. Give one plant water with the sugar substitute, and give the other plant plain water. Keep the plants in identical environments. Give each plant the same amount of water every day. Measure their growth over the course of three months.

Analyze the results and make a conclusion: After three months, analyze the data to see whether one plant grew taller than the other.

Test/Modify: If the hypothesis is proven right, repeat the experiment. If not, modify the hypothesis and design a new experiment.

Step-by-step explanation:

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Answer 2

• The independent variable is the concentration of sucralose present in the plant.
• The dependent variable is the growth rate of the plant.

Step-by-step explanation:

The study designed through the steps of the scientific method would be done as follows:

Observation: Sucrose is a very important molecule for the development and growth of plants, based on which sucralose, which is formed from sucrose, can be important for the same factors.

Question: Can sucralose influence plant growth as well as sucrose?

Hypothesis: Sucralose may establish some influence on plant growth.

Experimentation: Select a number of seeds inoculated with sucralose molecules and select the same number of seeds that were not inoculated with anything. Provide the same type of soil and environmental factors so that seeds can grow in the same way. Weekly evaluate the growth of the plants generated by each seed for a certain period of time. After this period of time, measure the weight of the plants and their roots. Place the plant and root to dry in an oven and measure the weight of the plant and root once again.

Analysis of results: compare the average weekly growth of plants generated by inoculated seeds, with plants generated from uninoculated seeds. Compare the average weight of plants generated by seed inoculated before and after kiln-dried. Compare the weight average between plant roots generated by inoculated seeds before and after kiln-dried. Assess whether there was a significant difference between the means.

Conclusion: Using the data presented in the evaluation of the experiment, state whether the hypothesis developed provides true or false information.

Note: it is important that the seeds are from the same species of plant.