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5.2 Population size using quadrats
Exam question
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Describe how to use quadrats to estimate the population of daisies in a field.
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Total for this question: 4 marks
5.2 Population size using quadrats
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A student found a mean of 6 daisies per 0.25 m² quadrat. The field is 2 000 m². Estimate the daisy population.
(2)Total for this question: 2 marks
5.2 Population size using quadrats
Exam question
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Explain why quadrats should be placed randomly.
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Total for this question: 2 marks
5.2 Population size using quadrats
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Explain why many quadrats are used.
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Total for this question: 2 marks
5.2 Population size using quadrats
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Describe how to place quadrats randomly.
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Total for this question: 2 marks
5.2 Population size using quadrats
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Illustrative survey data.
| Quadrat | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Buttercups | 4 | 7 | 0 | 3 | 5 | 8 | 2 | 6 | 1 | 4 |
Calculate the mean number of buttercups per m².
(2)Total for this question: 2 marks
5.2 Population size using quadrats
Exam question
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| Quadrat | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Buttercups | 4 | 7 | 0 | 3 | 5 | 8 | 2 | 6 | 1 | 4 |
The field measures 50 m by 80 m. Use your mean to estimate the buttercup population.
(2)Total for this question: 2 marks
5.2 Population size using quadrats
Exam question
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| Quadrat | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Buttercups | 4 | 7 | 0 | 3 | 5 | 8 | 2 | 6 | 1 | 4 |
Suggest why quadrat 3 had no buttercups.
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Total for this question: 2 marks
Plan it with CORMMSS: Design an investigation (Logic Lab).
5.2 Population size using quadrats
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Link: practise planning on /subjects/igcse-biology/logic-lab/design-an-investigation.
Design an investigation to compare the population density of dandelions in a mown lawn and an unmown field.
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Total for this question: 6 marks
5.2 Population size using quadrats
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Explain why a rule is needed for plants on the edge of a quadrat.
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Total for this question: 2 marks
5.2 Population size using quadrats
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Explain why it is difficult to count grass plants in a quadrat.
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Total for this question: 2 marks
5.2 Population size using quadrats
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State one way to estimate abundance when individual plants are hard to count.
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Total for this question: 1 mark
5.2 Population size using quadrats
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Suggest why quadrats are not suitable for estimating a population of beetles.
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Total for this question: 2 marks
5.2 Population size using quadrats
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A square quadrat with 50 cm sides held 3 plantains. Calculate the density in plants per m².
(2)Total for this question: 2 marks
5.2 Population size using quadrats
Exam question
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A student used three quadrats to estimate a population of 30 000 clover plants. Evaluate the reliability of the estimate.
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Total for this question: 3 marks
