Anaerobic Respiration: Observing Yeast's Oxygen-Free Energy Production

The video explains anaerobic respiration, focusing on how organisms like yeast obtain energy from glucose without oxygen. It demonstrates an experiment using yeast, glucose, vegetable oil, and lime water to show yeast's anaerobic respiration. The setup involves mixing yeast with glucose and sealing it with oil to prevent oxygen entry. Observations after 40 minutes reveal carbon dioxide production, turning lime water cloudy. The video also discusses the chemical reactions involved and the applications of anaerobic respiration in food production, such as cheese and yogurt making.

What is anaerobic respiration?

• A process that uses water to produce energy.

• A process that requires oxygen to produce energy.

• A process that does not require oxygen to produce energy.

• A process that uses sunlight to produce energy.

What is the purpose of adding vegetable oil in the yeast experiment?

• To prevent oxygen from entering the solution.

• To provide nutrients to the yeast.

• To increase the temperature of the solution.

• To dissolve the glucose in the solution.

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

• It turns blue.

• It becomes clear.

• It turns cloudy.

• It changes to a solid.

What gas is produced by yeast during anaerobic respiration?

• Carbon dioxide

• Hydrogen

• Nitrogen

• Oxygen

What is the role of lime water in the experiment?

• To increase the temperature of the solution.

• To dissolve glucose in the solution.

• To react with carbon dioxide and form a precipitate.

• To provide nutrients to the yeast.

How does anaerobic respiration contribute to the texture of cheese?

• By making the cheese more acidic.

• By increasing the fat content of the cheese.

• By creating holes through the release of carbon dioxide.

• By adding flavor to the cheese.

Which of the following foods is produced using anaerobic respiration?

• Ice cream

• Butter

• Bread

• Cheese