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Cambridge IGCSE Environmental Management practice

Paper 1 structured question: Management of the harvesting of marine species

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Management of the harvesting of marine species

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Paper 1TheoryPractical6 marks

A study was conducted on the impact of closed fishing seasons on fish population recovery in a marine protected area. The table below shows the estimated fish population (in thousands) before and after a 3-month closed season over three years.

Results Table

Fish Population Recovery Data

YearPopulation Before Closed Season (thousands)Population After Closed Season (thousands)
Year 15060
Year 25570
Year 36580
  1. a

    Calculate the average increase in fish population after the closed season over the three years.

    Aim for approximately 3 distinct marking points.

    [3]
  2. b

    Explain how closed seasons help in managing marine fisheries sustainably.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 1 structured question: Management of the harvesting of marine species

Paper 1TheoryPractical6 marks

Method

Method to Investigate Mesh Size Effect

1. Select three different mesh sizes: small, medium, and large. 2. Use identical fishing nets with these mesh sizes in the same fishing area. 3. Conduct fishing sessions of equal duration for each net. 4. Count and record the number of juvenile fish caught in each net. 5. Repeat the experiment three times for each mesh size to ensure reliability.

Mesh SizeNumber of Juvenile Fish Caught
Small
Medium
Large
  1. a

    Identify the independent variable in this investigation.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Identify the dependent variable in this investigation.

    Aim for approximately 1 distinct marking point.

    [1]
  3. c

    Suggest one control variable that should be kept constant in this investigation and explain why.

    Aim for approximately 2 distinct marking points.

    [2]
  4. d

    Explain why repeating the experiment three times improves the reliability of the results.

    Aim for approximately 2 distinct marking points.

    [2]