Role of Carbon Dioxide in Respiration

What is the purpose of using potassium hydroxide in the plant respiration experiment?

• To measure the water level

• To create a vacuum

• To absorb carbon dioxide

• To provide nutrients to the seeds

What observation indicates that carbon dioxide is produced by germinating seeds?

• The seeds change color

• The water level in the beaker decreases

• The water level in the delivery tube rises

• The seeds stop germinating

In the human respiration experiment, what is the role of lime water?

• To measure the volume of exhaled air

• To turn milky in the presence of carbon dioxide

• To provide a source of carbon dioxide

• To absorb oxygen

What is the chemical reaction that occurs when carbon dioxide is bubbled through lime water?

• Formation of sodium chloride

• Formation of calcium carbonate

• Formation of magnesium oxide

• Formation of potassium hydroxide

Which gas is responsible for turning lime water milky?

• Hydrogen

• Oxygen

• Nitrogen

• Carbon dioxide