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Exam-style practice

Management of the harvesting of marine species answer explanations

Review worked answers and explanations for Management of the harvesting of marine species. Aligned to Cambridge IGCSE Environmental Management.

Answer explanations

Question 1 of 2

Review the answer support, then move sideways through the set.

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.

    [1]
  2. b

    Identify the dependent variable in this investigation.

    [1]
  3. c

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

    [2]
  4. d

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

    [2]