Cambridge IGCSE Environmental Management practice

Paper 1 structured question: Measuring and managing biodiversity

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Topic

Measuring and managing biodiversity

Exam-style question

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Paper 1TheoryPractical5 marks

A student plans to estimate the number of ground beetles in a woodland area using pitfall traps.

Method

Pitfall Trap Sampling Method

The student places 10 pitfall traps randomly across the woodland. Each trap is a small container sunk into the ground to catch beetles moving on the surface. Traps are left open for 24 hours before counting the beetles caught.

a
Identify the independent variable in this investigation.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Suggest one control variable that should be kept constant to ensure a fair test.
Your answer
Aim for approximately 1 distinct marking point.
[1]
c
Explain why the student should repeat the sampling at each location.
Your answer
Aim for approximately 2 distinct marking points.
[2]
d
Describe one safety consideration when setting pitfall traps in the woodland.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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