a) (i) What is meant by aerobic respiration?
(ii) Aerobic respiration takes place in two stages - Leaving Cert Biology - Question 14 - 2012
Question 14
a) (i) What is meant by aerobic respiration?
(ii) Aerobic respiration takes place in two stages.
1. Where in a cell does stage 1 occur?
2. Where in a cell does stage... show full transcript
Worked Solution & Example Answer:a) (i) What is meant by aerobic respiration?
(ii) Aerobic respiration takes place in two stages - Leaving Cert Biology - Question 14 - 2012
Step 1
What is meant by aerobic respiration?
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Answer
Aerobic respiration refers to the process in which food is broken down to produce energy in the presence of oxygen. This energy production is essential for various cellular activities.
Step 2
1. Where in a cell does stage 1 occur?
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Answer
Stage 1 of aerobic respiration occurs in the cytoplasm of the cell.
Step 3
2. Where in a cell does stage 2 occur?
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Answer
Stage 2 of aerobic respiration takes place in the mitochondria of the cell.
Step 4
Which type of respiration, aerobic or anaerobic, produces more energy?
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Answer
Aerobic respiration produces more energy compared to anaerobic respiration, as it fully oxidizes glucose, leading to greater ATP yield.
Step 5
Draw a labelled diagram showing how alcohol may be produced in the laboratory.
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Answer
A labelled diagram should include:
A container or flask
A liquid (e.g., glucose solution)
An oil or airlock to prevent contamination. Elements to label include:
Glucose
Yeast
The liquid medium.
Additionally, indicate the production of CO₂, and represent the bubbles formed during fermentation. Finally, conclude that fermentation is complete when bubbling stops.
Step 6
1. Name another substance that is produced during the fermentation process.
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Answer
Another substance produced during fermentation is carbon dioxide (CO₂).
Step 7
2. How would you detect this other substance?
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The presence of carbon dioxide can be detected by using limewater. If CO₂ is present, the limewater will turn cloudy due to the formation of calcium carbonate.
Step 8
3. How would you know when fermentation had finished?
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Answer
Fermentation is considered complete when bubbling ceases, indicating that no more carbon dioxide is being produced.
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