(a) (i) What gas must be absent for anaerobic respiration to occur?
(ii) Does anaerobic respiration release more or less energy than aerobic respiration?
(b) Answer the following questions in relation to the production of alcohol by yeast - Leaving Cert Biology - Question 8 - 2017
Question 8
(a) (i) What gas must be absent for anaerobic respiration to occur?
(ii) Does anaerobic respiration release more or less energy than aerobic respiration?
(b) Answe... show full transcript
Worked Solution & Example Answer:(a) (i) What gas must be absent for anaerobic respiration to occur?
(ii) Does anaerobic respiration release more or less energy than aerobic respiration?
(b) Answer the following questions in relation to the production of alcohol by yeast - Leaving Cert Biology - Question 8 - 2017
Step 1
What gas must be absent for anaerobic respiration to occur?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The gas that must be absent for anaerobic respiration to occur is oxygen.
Step 2
Does anaerobic respiration release more or less energy than aerobic respiration?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Anaerobic respiration releases less energy compared to aerobic respiration.
Step 3
To which flask was the yeast added?
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The yeast was added to Flask A.
Step 4
Give a reason for your choice.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Flask A contains bubbles (or CO₂), indicating that fermentation is taking place with the yeast.
Step 5
What is the purpose of the other flask?
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The purpose of the other flask (Flask B) is to act as a control.
Step 6
Name the two substances in the original solution in the flasks.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Glucose or sugar.
Water.
Step 7
What is the purpose of the water bath?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The purpose of the water bath is to keep the temperature constant.
Step 8
What is the purpose of a fermentation lock?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The fermentation lock is used to keep oxygen out or to avoid contamination.
Step 9
Say what test you performed to show the presence of alcohol and say what colour indicated a positive result.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The test performed to show the presence of alcohol is the iodine test. The positive colour is yellow.
Join the Leaving Cert students using SimpleStudy...
