6 – To Investigate the Conditions Necessary for Fermentation (LC 2027) (Leaving Cert Biology): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
ShowHide
Practise the questions
12 questions from this quiz
What are the two main products of fermentation by yeast?
What are the two main products of fermentation by yeast?
Ethanol and carbon dioxide
Why is the glucose solution boiled for 5 minutes during setup?
Why is the glucose solution boiled for 5 minutes during setup?
To remove dissolved gases
What is the purpose of adding an oil layer to the fermentation flask?
What is the purpose of adding an oil layer to the fermentation flask?
Prevents oxygen entering the solution
What is the function of the airlock in fermentation?
What is the function of the airlock in fermentation?
Lets CO₂ escape, blocks O₂ entry
What is the ideal temperature for maximum yeast fermentation?
What is the ideal temperature for maximum yeast fermentation?
30°C
What happens to limewater when carbon dioxide is present?
What happens to limewater when carbon dioxide is present?
It turns cloudy or milky
In the control experiment, why is boiled yeast used?
In the control experiment, why is boiled yeast used?
It kills the enzymes
What indicates a positive result in the ethanol test?
What indicates a positive result in the ethanol test?
Pale yellow crystals form
What happens to yeast enzymes at temperatures above 50°C?
What happens to yeast enzymes at temperatures above 50°C?
They become denatured
Why are anaerobic conditions essential for ethanol production?
Why are anaerobic conditions essential for ethanol production?
With O₂, yeast makes water not ethanol
Which four conditions are necessary for fermentation?
Which four conditions are necessary for fermentation?
Glucose, yeast, 30°C, anaerobic
Why are control experiments essential in fermentation investigations?
Why are control experiments essential in fermentation investigations?
To prove each component is necessary