12 exam-style questions. Write your answer, check it against the mark scheme and tick the points you earned. Your marks stay on this device. Your writing is not saved.
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6.2 Carbon dioxide, temperature and crop yield
Exam question
Mark points shown after marking
Explain how increasing CO₂ concentration increases crop yield.
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Total for this question: 3 marks
6.2 Carbon dioxide, temperature and crop yield
Exam question
Mark points shown after marking
Explain why increasing CO₂ beyond a certain level does not increase yield.
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Total for this question: 2 marks
6.2 Carbon dioxide, temperature and crop yield
Exam question
Mark points shown after marking
Illustrative data from a glasshouse trial.
| CO₂ / ppm | Yield / kg per m² |
|---|---|
| 400 | 30 |
| 600 | 38 |
| 800 | 44 |
| 1 000 | 46 |
| 1 200 | 46 |
Plot tomato yield against CO₂ concentration. Join your points with straight lines using a ruler.
(5)Graph skills: SLAPUK and choosing a scale
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: 5 marks
6.2 Carbon dioxide, temperature and crop yield
Exam question
Mark points shown after marking
| CO₂ / ppm | Yield / kg per m² |
|---|---|
| 400 | 30 |
| 600 | 38 |
| 800 | 44 |
| 1 000 | 46 |
| 1 200 | 46 |
Explain the shape of the graph above 1 000 ppm.
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Total for this question: 2 marks
6.2 Carbon dioxide, temperature and crop yield
Exam question
Mark points shown after marking
| CO₂ / ppm | Yield / kg per m² |
|---|---|
| 400 | 30 |
| 600 | 38 |
| 800 | 44 |
| 1 000 | 46 |
| 1 200 | 46 |
Calculate the percentage increase in yield from 400 ppm to 1 000 ppm.
(2)Total for this question: 2 marks
6.2 Carbon dioxide, temperature and crop yield
Exam question
Mark points shown after marking
| CO₂ / ppm | Yield / kg per m² |
|---|---|
| 400 | 30 |
| 600 | 38 |
| 800 | 44 |
| 1 000 | 46 |
| 1 200 | 46 |
Suggest the most economical CO₂ concentration for this crop.
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Total for this question: 2 marks
6.2 Carbon dioxide, temperature and crop yield
Exam question
Mark points shown after marking
Explain why increasing temperature increases yield up to an optimum.
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Total for this question: 2 marks
6.2 Carbon dioxide, temperature and crop yield
Exam question
Mark points shown after marking
Explain why yield falls at very high temperatures.
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Total for this question: 2 marks
6.2 Carbon dioxide, temperature and crop yield
Exam question
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State the term for a factor that stops photosynthesis increasing.
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Total for this question: 1 mark
6.2 Carbon dioxide, temperature and crop yield
Exam question
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Suggest why farmers monitor CO₂ levels with sensors.
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Total for this question: 2 marks
6.2 Carbon dioxide, temperature and crop yield
Exam question
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Explain how raising temperature at night could reduce yield.
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Total for this question: 2 marks
Plan it with CORMMSS: Design an investigation (Logic Lab).
6.2 Carbon dioxide, temperature and crop yield
Exam question
Mark points shown after marking
Link: practise planning on /subjects/igcse-biology/logic-lab/design-an-investigation.
Design an investigation to find out how carbon dioxide concentration affects the growth of cress seedlings.
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Total for this question: 6 marks
