A) the method is less effective as compared with the use of insecticides
B) the predator does not always survive when transferred to a new environment
C) the predator develop a preference to other diets and may itself become a pest
D) the practical difficulty of introducing the predator to specific area
Correct Answer: B
Solution :
Harmful insects and pests can be controlled through biological control by the introduction of their natural predators. The major difficulty in this control is that the predator does not always survive when transferred to a new environment.
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