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By Ecology and General Silviculture No Comments

One of the major difficulties in the biological control of insect pests is that:

A. The predator develops a preference to other diets and may itself become a pest
B. They do not always survive when transferred to a new environment
C. The method is less effective as compared to the use of insecticides
D. The practical difficulty in introducing the predator to specific area

Related Mcqs:

  1. Peacock eats a snake and snake eats frog and frog eats insect while insect eats green plant, then position of peacock is:

    A. Primary producer
    B. Secondary Producer
    C. Decomposer
    D. Apex of food pyramids

  2. Which adaptation is seen in the leaf insect?

    A. Migration
    B. Camouflaging
    C. Batesion mimicry
    D. Mullerian mimicry

  3. Biological equilibrium is found among the:

    A. Producers and consumers
    B. Producers and decomposers
    C. Producers, consumers and decomposers
    D. Producers and light

  4. Relative biological effectiveness (RBE) is usually referred to damages caused by:

    A. Pollution
    B. High temperature
    C. Low temperature
    D. Radiation

  5. The causes of loss of biological diversity are:

    A. Over hunting is perhaps the most obvious direct cause of extinction in animals, as it has affected several large and well-known species
    B. Genetic diversity as represented by genetic differences between discrete populations with wild species, is liable to reduction as result of the same factors affecting species
    C. A major, though at present largely unpredictable, change in natural environments is likely to occur within the next century as a result of large-scale changes in global climate and weather patterns
    D. All of the above

  6. Biological diversity resources are:

    A. Food
    B. Pharmaceuticals
    C. Both (a) & (b)
    D. None of these

  7. The biological weathering occurs due to the action of:

    A. Acids
    B. Alkalies
    C. Oxygen
    D. Carbon dioxide

  8. Among the plants listed, point out one that does not fit into biological group represented by other plants

    A. Euphorbia
    B. Acacia
    C. Vallisneria
    D. Aloe

  9. Biological control component is central to advanced agriculture production. Which of the following is used as a third generation pesticide?

    A. Pathogens
    B. Pheromones
    C. Insect repellant
    D. Insect hormone analogue

  10. The maximum biological magnification of DDT through food web is seen in:

    A. Algae
    B. Bacteria
    C. Higher plants
    D. Man

The correct answer to the question: "One of the major difficulties in the biological control of insect pests is that:" is "The predator develops a preference to other diets and may itself become a pest ".

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