17 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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4.4 Pollen tube, seed and fruit
Exam question
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Describe how fertilisation occurs in a flowering plant after pollination.
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Total for this question: 3 marks
4.4 Pollen tube, seed and fruit
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State what each part becomes after fertilisation: ovule; ovary.
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Total for this question: 2 marks
4.4 Pollen tube, seed and fruit
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What does the ovule develop into after fertilisation?
(1)Total for this question: 1 mark
4.4 Pollen tube, seed and fruit
Exam question
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Explain why the pollen tube grows down the style.
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Total for this question: 2 marks
4.4 Pollen tube, seed and fruit
Exam question
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Describe how to investigate pollen tube growth.
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Total for this question: 2 marks
4.4 Pollen tube, seed and fruit
Exam question
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Illustrative data.
| Sucrose / % | Tube length / µm |
|---|---|
| 0 | 20 |
| 5 | 140 |
| 10 | 310 |
| 15 | 260 |
| 20 | 90 |
Plot a graph of the results. Join your points with straight lines using a ruler.
(5)Graph skills: SLAPUK and choosing a scale
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Total for this question: 5 marks
4.4 Pollen tube, seed and fruit
Exam question
Mark points shown after marking
| Sucrose / % | Tube length / µm |
|---|---|
| 0 | 20 |
| 5 | 140 |
| 10 | 310 |
| 15 | 260 |
| 20 | 90 |
Describe the effect of sucrose concentration on pollen tube growth.
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Total for this question: 2 marks
4.4 Pollen tube, seed and fruit
Exam question
Mark points shown after marking
| Sucrose / % | Tube length / µm |
|---|---|
| 0 | 20 |
| 5 | 140 |
| 10 | 310 |
| 15 | 260 |
| 20 | 90 |
Suggest why pollen tubes grow less in 20 % sucrose.
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Total for this question: 2 marks
4.4 Pollen tube, seed and fruit
Exam question
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Explain why each pollen grain needs its own pollen tube to fertilise an ovule.
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Total for this question: 2 marks
4.4 Pollen tube, seed and fruit
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Explain why a pea pod with eight peas must have been pollinated by at least eight pollen grains.
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Total for this question: 2 marks
4.4 Pollen tube, seed and fruit
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Describe how fruits help to disperse seeds.
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Total for this question: 2 marks
4.4 Pollen tube, seed and fruit
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Explain why seeds need to be dispersed away from the parent.
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Total for this question: 2 marks
4.4 Pollen tube, seed and fruit
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State the role of the micropyle.
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Total for this question: 1 mark
4.4 Pollen tube, seed and fruit
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Suggest why the petals wither after fertilisation.
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Total for this question: 2 marks
4.4 Pollen tube, seed and fruit
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Which part of a flower develops into the fruit?
(1)Total for this question: 1 mark
