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4.5 Conditions for seed germination
Exam question
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State the three conditions needed for germination.
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Total for this question: 3 marks
4.5 Conditions for seed germination
Exam question
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Explain why seeds need water to germinate.
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Total for this question: 2 marks
4.5 Conditions for seed germination
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Explain why seeds need oxygen to germinate.
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Total for this question: 2 marks
4.5 Conditions for seed germination
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Explain why seeds do not germinate at very low temperatures.
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Total for this question: 2 marks
4.5 Conditions for seed germination
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Illustrative class data.
| Tube | Conditions | Seeds germinated / 20 |
|---|---|---|
| A | moist cotton wool, 20 °C, air | 19 |
| B | dry cotton wool, 20 °C, air | 0 |
| C | moist cotton wool, 4 °C, air | 2 |
| D | boiled water covering seeds, 20 °C, oil layer | 1 |
Explain the results for tubes B, C and D.
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Total for this question: 3 marks
4.5 Conditions for seed germination
Exam question
Mark points shown after marking
| Tube | Conditions | Seeds germinated / 20 |
|---|---|---|
| A | moist cotton wool, 20 °C, air | 19 |
| B | dry cotton wool, 20 °C, air | 0 |
| C | moist cotton wool, 4 °C, air | 2 |
| D | boiled water covering seeds, 20 °C, oil layer | 1 |
Calculate the percentage germination in tube A.
(2)Total for this question: 2 marks
4.5 Conditions for seed germination
Exam question
Mark points shown after marking
| Tube | Conditions | Seeds germinated / 20 |
|---|---|---|
| A | moist cotton wool, 20 °C, air | 19 |
| B | dry cotton wool, 20 °C, air | 0 |
| C | moist cotton wool, 4 °C, air | 2 |
| D | boiled water covering seeds, 20 °C, oil layer | 1 |
Explain why the water in tube D was boiled and covered with oil.
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Total for this question: 2 marks
4.5 Conditions for seed germination
Exam question
Mark points shown after marking
| Tube | Conditions | Seeds germinated / 20 |
|---|---|---|
| A | moist cotton wool, 20 °C, air | 19 |
| B | dry cotton wool, 20 °C, air | 0 |
| C | moist cotton wool, 4 °C, air | 2 |
| D | boiled water covering seeds, 20 °C, oil layer | 1 |
Suggest why one seed in tube A did not germinate.
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Total for this question: 2 marks
4.5 Conditions for seed germination
Exam question
Mark points shown after marking
| Tube | Conditions | Seeds germinated / 20 |
|---|---|---|
| A | moist cotton wool, 20 °C, air | 19 |
| B | dry cotton wool, 20 °C, air | 0 |
| C | moist cotton wool, 4 °C, air | 2 |
| D | boiled water covering seeds, 20 °C, oil layer | 1 |
Suggest how the reliability of this investigation could be improved.
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Total for this question: 2 marks
4.5 Conditions for seed germination
Exam question
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Light is NOT needed for the germination of most seeds. Why?
(1)Total for this question: 1 mark
Plan it with CORMMSS: Design an investigation (Logic Lab).
4.5 Conditions for seed germination
Exam question
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Link: practise planning on /subjects/igcse-biology/logic-lab/design-an-investigation.
Design an investigation to find out how temperature affects the germination of mung beans.
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Total for this question: 6 marks
4.5 Conditions for seed germination
Exam question
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Illustrative data for a bean variety.
| Temperature / °C | Mean time / days |
|---|---|
| 10 | 9.0 |
| 15 | 5.5 |
| 20 | 3.5 |
| 25 | 2.5 |
| 30 | 2.0 |
| 35 | 4.0 |
Plot a graph of mean germination time against temperature. 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
4.5 Conditions for seed germination
Exam question
Mark points shown after marking
| Temperature / °C | Mean time / days |
|---|---|
| 10 | 9.0 |
| 15 | 5.5 |
| 20 | 3.5 |
| 25 | 2.5 |
| 30 | 2.0 |
| 35 | 4.0 |
Describe the effect of temperature on germination time.
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Total for this question: 3 marks
4.5 Conditions for seed germination
Exam question
Mark points shown after marking
| Temperature / °C | Mean time / days |
|---|---|
| 10 | 9.0 |
| 15 | 5.5 |
| 20 | 3.5 |
| 25 | 2.5 |
| 30 | 2.0 |
| 35 | 4.0 |
Explain why germination is slower at 35 °C than at 30 °C.
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Total for this question: 2 marks
4.5 Conditions for seed germination
Exam question
Mark points shown after marking
| Temperature / °C | Mean time / days |
|---|---|
| 10 | 9.0 |
| 15 | 5.5 |
| 20 | 3.5 |
| 25 | 2.5 |
| 30 | 2.0 |
| 35 | 4.0 |
Calculate the rate of germination at 20 °C as 1 ÷ time.
(2)Total for this question: 2 marks
