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QUESTIONS 1. What does the gradual change to red indicate in terms of the pH of the solution? 2. What does the change in pH indicate about the carbon dioxide in the solution? 3. What happened to the carbon dioxide? 4. Would you expect the pH of the water in a shallow pond with a lot of submerged plants and algae to change over a 24 hour period? If so, how would it change? 5. Why did we include the tube without Elodea in the experiment?

QUESTIONS 1. What does the gradual change to red indicate in terms of the pH of the solution? 2. What does the change in pH indicate about the carbon dioxide in the solution? 3. What happened to the carbon dioxide? 4. Would you expect the pH of the water in a shallow pond with a lot of submerged plants and algae to change over a 24 hour period? If so, how would it change? 5. Why did we include the tube without Elodea in the experiment?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Procedure 1: The Uptake of Carbon Dioxide During Photosynthesis During the second stage of photosynthesis, the plant takes up carbon dioxide (CO₂) and reduces it to carbohydrate. Therefore, the carbon dioxide in the solution surrounding aquatic plants should disappear as photosynthesis takes place. We have already used sodium bicarbonate as a carbon source but in this procedure we will use the carbon dioxide in expired breathe as a carbon dioxide source. PROCEDURE 1. Fill two test tubes with phenol red solution. (Phenol red is a pH indicator; it is yellow in an acid and red in a neutral solution.) 2. Using a straw, blow bubbles into both the test tubes until the phenol red turns from red to yellow. When carbon dioxide dissolves in water, it forms the acid carbonic acid (H,CO₂). 3. Place a sprig of Elodea in one test tube and place both test tubes side by side in a test tube Protect the Elodea from the heat of the lamp with a large beaker filled rack in front of a with water. 4. Check the color of the solutions periodically until you detect a change in color from yellow to red. (The time required for the color to change varies but generally takes from 1/2-1 hour.) QUESTIONS 1. What does the gradual change to red indicate in terms of the pH of the solution? 2. What does the change in pH indicate about the carbon dioxide in the solution? 3. What happened to the carbon dioxide? 4. Would you expect the pH of the water in a shallow pond with a lot of submerged plants and algae to change over a 24 hour period? If so, how would it change? 5. Why did we include the tube without Elodea in the experiment?
Transcribed Image Text:Procedure 1: The Uptake of Carbon Dioxide During Photosynthesis During the second stage of photosynthesis, the plant takes up carbon dioxide (CO₂) and reduces it to carbohydrate. Therefore, the carbon dioxide in the solution surrounding aquatic plants should disappear as photosynthesis takes place. We have already used sodium bicarbonate as a carbon source but in this procedure we will use the carbon dioxide in expired breathe as a carbon dioxide source. PROCEDURE 1. Fill two test tubes with phenol red solution. (Phenol red is a pH indicator; it is yellow in an acid and red in a neutral solution.) 2. Using a straw, blow bubbles into both the test tubes until the phenol red turns from red to yellow. When carbon dioxide dissolves in water, it forms the acid carbonic acid (H,CO₂). 3. Place a sprig of Elodea in one test tube and place both test tubes side by side in a test tube Protect the Elodea from the heat of the lamp with a large beaker filled rack in front of a with water. 4. Check the color of the solutions periodically until you detect a change in color from yellow to red. (The time required for the color to change varies but generally takes from 1/2-1 hour.) QUESTIONS 1. What does the gradual change to red indicate in terms of the pH of the solution? 2. What does the change in pH indicate about the carbon dioxide in the solution? 3. What happened to the carbon dioxide? 4. Would you expect the pH of the water in a shallow pond with a lot of submerged plants and algae to change over a 24 hour period? If so, how would it change? 5. Why did we include the tube without Elodea in the experiment?
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