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2.39 Carbon dioxide and heat from respiring organisms
Exam question
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Which indicator changes from red to yellow as carbon dioxide concentration increases?
(1)Total for this question: 1 mark
Lesson: 2.39 Carbon dioxide and heat from respiring organisms
2.39 Carbon dioxide and heat from respiring organisms
Exam question
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Why is a thermos (vacuum) flask used to show that germinating seeds release heat?
(1)Total for this question: 1 mark
Lesson: 2.39 Carbon dioxide and heat from respiring organisms
2.39 Carbon dioxide and heat from respiring organisms
Exam question
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Describe how you could show that germinating peas release heat.
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Total for this question: 3 marks
Lesson: 2.39 Carbon dioxide and heat from respiring organisms
2.39 Carbon dioxide and heat from respiring organisms
Exam question
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Explain why the peas in a control flask are boiled and then washed in disinfectant.
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Total for this question: 2 marks
Lesson: 2.39 Carbon dioxide and heat from respiring organisms
2.39 Carbon dioxide and heat from respiring organisms
Exam question
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Explain why the vacuum flask is placed upside down with cotton wool in the neck.
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Total for this question: 2 marks
Lesson: 2.39 Carbon dioxide and heat from respiring organisms
2.39 Carbon dioxide and heat from respiring organisms
Exam question
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Describe how hydrogencarbonate indicator can be used to show that woodlice produce carbon dioxide.
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Total for this question: 3 marks
Lesson: 2.39 Carbon dioxide and heat from respiring organisms
2.39 Carbon dioxide and heat from respiring organisms
Exam question
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Explain why woodlice are placed on a gauze platform rather than in the indicator.
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Total for this question: 2 marks
Lesson: 2.39 Carbon dioxide and heat from respiring organisms
2.39 Carbon dioxide and heat from respiring organisms
Exam question
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Explain why a tube with glass beads instead of woodlice is set up.
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Total for this question: 2 marks
Lesson: 2.39 Carbon dioxide and heat from respiring organisms
2.39 Carbon dioxide and heat from respiring organisms
Exam question
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| Organism | Distance in 10 min / mm |
|---|---|
| Germinating peas | 24 |
| Boiled peas | 0 |
| Woodlice | 31 |
| Glass beads (control) | 0 |
Using the table, identify which organisms were respiring and give a reason.
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Total for this question: 2 marks
Lesson: 2.39 Carbon dioxide and heat from respiring organisms
2.39 Carbon dioxide and heat from respiring organisms
Exam question
Mark points shown after marking
| Organism | Distance in 10 min / mm |
|---|---|
| Germinating peas | 24 |
| Boiled peas | 0 |
| Woodlice | 31 |
| Glass beads (control) | 0 |
Using the table, calculate the rate of movement of the liquid for woodlice in mm per minute.
(2)Total for this question: 2 marks
Lesson: 2.39 Carbon dioxide and heat from respiring organisms
2.39 Carbon dioxide and heat from respiring organisms
Exam question
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In the respirometer, soda lime absorbs carbon dioxide. Explain why the coloured liquid moves towards the organisms.
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Total for this question: 3 marks
Lesson: 2.39 Carbon dioxide and heat from respiring organisms
2.39 Carbon dioxide and heat from respiring organisms
Exam question
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Suggest why the respirometer tube is placed in a water bath.
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Total for this question: 2 marks
Lesson: 2.39 Carbon dioxide and heat from respiring organisms
2.39 Carbon dioxide and heat from respiring organisms
Exam question
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Predict the colour of hydrogencarbonate indicator after 30 minutes in a sealed tube with germinating seeds. Give a reason.
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Total for this question: 2 marks
Lesson: 2.39 Carbon dioxide and heat from respiring organisms
2.39 Carbon dioxide and heat from respiring organisms
Exam question
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| Day | Germinating peas / °C | Boiled peas / °C |
|---|---|---|
| 0 | 20 | 20 |
| 1 | 22 | 20 |
| 2 | 24 | 20 |
| 3 | 26 | 20 |
| 4 | 27 | 20 |
The table shows the temperature in two vacuum flasks. Describe the results.
(2)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 2 marks
Lesson: 2.39 Carbon dioxide and heat from respiring organisms
2.39 Carbon dioxide and heat from respiring organisms
Exam question
Mark points shown after marking
| Day | Germinating peas / °C | Boiled peas / °C |
|---|---|---|
| 0 | 20 | 20 |
| 1 | 22 | 20 |
| 2 | 24 | 20 |
| 3 | 26 | 20 |
| 4 | 27 | 20 |
Calculate the temperature rise in the flask of germinating peas between day 0 and day 4.
(2)Total for this question: 2 marks
Lesson: 2.39 Carbon dioxide and heat from respiring organisms
