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6.10 Selective breeding of plants
Exam question
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Describe how selective breeding could produce a wheat variety with a high yield.
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Total for this question: 4 marks
6.10 Selective breeding of plants
Exam question
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What is selective breeding?
(1)Total for this question: 1 mark
6.10 Selective breeding of plants
Exam question
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Give two characteristics selected for in crop plants.
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Total for this question: 2 marks
6.10 Selective breeding of plants
Exam question
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Explain why selective breeding takes many years.
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Total for this question: 2 marks
6.10 Selective breeding of plants
Exam question
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Explain why selective breeding reduces genetic variation.
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Total for this question: 2 marks
6.10 Selective breeding of plants
Exam question
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Explain why reduced variation can be a problem for crops.
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Total for this question: 2 marks
6.10 Selective breeding of plants
Exam question
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Explain why short-stemmed wheat varieties were bred.
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Total for this question: 2 marks
6.10 Selective breeding of plants
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Compare selective breeding and natural selection.
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Total for this question: 2 marks
6.10 Selective breeding of plants
Exam question
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Illustrative breeding programme data.
| Generation | Yield / tonnes per hectare |
|---|---|
| 1 | 4.0 |
| 3 | 4.6 |
| 5 | 5.3 |
| 7 | 5.8 |
| 9 | 6.0 |
Plot mean yield against generation. 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
6.10 Selective breeding of plants
Exam question
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| Generation | Yield / tonnes per hectare |
|---|---|
| 1 | 4.0 |
| 3 | 4.6 |
| 5 | 5.3 |
| 7 | 5.8 |
| 9 | 6.0 |
Suggest why the increase in yield became smaller in later generations.
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Total for this question: 2 marks
6.10 Selective breeding of plants
Exam question
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Suggest why plant breeders keep seed banks of old varieties.
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Total for this question: 2 marks
6.10 Selective breeding of plants
Exam question
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Explain how disease resistance in crops benefits farmers.
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Total for this question: 2 marks
6.10 Selective breeding of plants
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Identify another name for selective breeding.
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Total for this question: 1 mark
6.10 Selective breeding of plants
Exam question
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Explain why crossing two different varieties can produce a better plant.
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Total for this question: 2 marks
6.10 Selective breeding of plants
Exam question
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State the type of variation that selective breeding works on.
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Total for this question: 1 mark
