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Cambridge IGCSE Environmental Management practice

Which stage of the malaria parasite is injected into humans by mosquitoes?

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Show answerManaging water-related disease revisionRevise the key idea

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MCQ

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cambridge_mcq

Style

Topic

Managing water-related disease

Exam-style question

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Which stage of the malaria parasite is injected into humans by mosquitoes?.

  1. A.Merozoites
  2. B.Gametocytes
  3. C.Sporozoites
  4. D.Trophozoites

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Paper 1 structured question: Managing water-related disease

Paper 1TheoryPractical6 marks

Method

Method to Test Mosquito Control Techniques

A student sets up three small enclosed areas with stagnant water to breed mosquitoes. Area A is left untreated as a control. Area B is treated with an insecticide spray. Area C has mosquito larvae removed daily. The number of adult mosquitoes emerging is counted after 10 days.

AreaTreatmentNumber of Adult Mosquitoes
ANo treatment50
BInsecticide spray10
CLarvae removal15
  1. a

    State 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

    Describe how the student could improve the reliability of the results.

    Aim for approximately 2 distinct marking points.

    [2]