Gas Exchange and Chemical Reactions

The video tutorial demonstrates an anaerobic reaction by yeast. It begins with setting up an experiment using a test tube, glucose, yeast, and water. Oil is added to prevent air contact. A glass tube is inserted, and the setup is placed in warm water. The reaction is observed as the lime water turns milky due to carbon dioxide released by yeast during anaerobic respiration.

What is the purpose of adding oil to the solution in the test tube?

• To enhance the reaction speed

• To prevent the solution from evaporating

• To prevent the solution from coming into contact with air

• To make the solution more viscous

What is the role of the glass tube in the experiment?

• To mix the solution thoroughly

• To transfer carbon dioxide to the lime water

• To allow air to enter the solution

• To measure the temperature of the solution

Why is one end of the glass tube placed in lime water?

• To observe the color change in lime water

• To measure the pH of the solution

• To detect the presence of carbon dioxide

• To cool down the solution

What change is observed in the lime water during the experiment?

• It turns red

• It turns blue

• It turns milky

• It turns clear

What gas is responsible for the change in lime water?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

What process is the yeast undergoing in the absence of oxygen?

• Anaerobic respiration

• Fermentation

• Aerobic respiration

• Photosynthesis