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SHS Biology · Year 2

Economically Important Insects practice questions

Distinctive features, life cycles and economic importance of the grain weevil, butterfly, housefly and honeybee.

22 questions in this topic: 9 recall, 7 applying skills and concepts, 4 strategic thinking and 2 extended thinking. Every one carries a written explanation.

Sample questions

3 of 22 questions in this topic. Sign up to answer them and see the explanations.

  1. Question 1Recall

    Storing grain in airtight containers is a control method for the grain weevil mainly because it

    • aphysically prevents weevils from getting inside the grain
    • bincreases the moisture content of the grain
    • cfeeds the weevils so they leave the grain alone
    • dhas no effect on weevil infestation
  2. Question 2Extended thinking

    Honeybees have pollen baskets and a proboscis, while grain weevils have a rostrum and hardened forewings (elytra). Explain how each set of structures reflects the very different lifestyles of these two insects.

    • aThe honeybee's pollen baskets and proboscis support a mobile, flower-foraging lifestyle for collecting nectar and pollen, while the weevil's rostrum and hardened elytra support a lifestyle of boring into and living protected inside grains
    • bBoth sets of structures serve identical functions in both insects
    • cPollen baskets are used for boring into grains
    • dThe rostrum is used for collecting nectar
  3. Question 3Strategic thinking

    A farmer needs to control a grain weevil infestation but wants to avoid using chemicals due to cost and safety concerns. Propose the most appropriate combination of methods from those covered, and justify your choice.

    • aCombine airtight storage, thorough sun-drying to remove moisture, and biological control with natural predators — all non-chemical methods that target different aspects of weevil survival and infestation
    • bRely solely on fumigation with pesticides
    • cDo nothing, since non-chemical methods do not exist
    • dAdd more moisture to the grain to discourage weevils

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