Question

a student performed an experiment to test the hypothesis that the rate of fermentation in yeast will not be affected if different amounts of yeast are used. for the experiment, the student labeled three test - tubes 1, 2, and 3. the student placed the test tubes in a water bath at 35°c and measured the amount of co₂ produced every two minutes using a respirometer. the graph shows the results of the experiment. what can be concluded from the experimental results? the hypothesis was incorrect because the amount of co₂ produced in test tube 2 was much higher than test tube 1. the hypothesis was correct because co₂ was produced in test tube 3. the hypothesis was incorrect because the amount of co₂ produced in test tube 2 was less than test tube 3. the hypothesis was correct because no co₂ was produced in test tube 1.

Explanation:

Step1: Identify the hypothesis

The hypothesis is that the rate of fermentation in yeast will not be affected if different amounts of yeast are used.

Step2: Analyze the experimental setup

Test - tube 1 has 0 g of yeast, test - tube 2 has 2 g of yeast, and test - tube 3 has 4 g of yeast. All have 10 mL of distilled water and 4 mL of glucose.

Step3: Examine the results

From the graph, we can see that the amount of CO₂ produced is different in each test - tube. Test - tube 3 (with more yeast) produces more CO₂ than test - tube 2 (less yeast), and test - tube 1 (no yeast) produces no CO₂. This shows that the amount of yeast affects the rate of fermentation.

Answer:

The hypothesis was incorrect because the amount of CO₂ produced in Test Tube 2 was less than Test Tube 3.