SRMJEE 2019 Paper with key

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Question : 127 of 140

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One of the major difficulties in the biological control of insect pest is that

the method is less effective as compared with the use of insecticides
the practical difficulty of introducing the predator to specific areas
the predator develops a preference to other diets and may itself become a pest
the predator does not always survive when transferred to a new environment

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