12th Class Biology Sample Paper Biology - Sample Paper-8

  • question_answer
    (i) Eradication of insects pest is not recommended by organic farmers. Explain by giving reasons.
    (ii) How do ladybird beetles and dragonflies act as biocontrol agents?

    Answer:

    (i) The organic farmers do not recommend eradication of insects pests as without them, the beneficial predatory and parasitic insects which depend upon pests for food or as hosts will not be able to survive.
    (ii) The ladybird beetles and dragonflies feed upon aphids and mosquitoes, respectively. Hence, they act as biocontrol agents and help to get rid of them.


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