Structural perfections exhibited by the insect pests.
1) Exoskeleton
The exoskeleton or body wall or integument is made up of chitin. The advantages of exoskeleton are many, viz., it provides a large area for attachment of muscles, provides complete protection to the vital organs from external injury, controls evaporation and so affords an excellent mechanism to protect against desiccation. Further, the exoskeleton gives the insects much physical strength without their being too heavy and also allows enormous modifications.
2) Small Size
Small size of insects favours subsistence and shelter. The chances of survival of the species are increased, it is easier for the individuals to subsist on small quantities of food and to take refuge in small niches against the vagaries of nature. Both these advantages favour increase in the number of individuals in the insect populations. With larger numbers resulting from smaller size the chances of variability and mutation also increase, thus making it possible for nature to conduct a larger number of trials in evolution. Lastly, the smaller size leads to greater proportionate efficiency.
3) Functional Wings
The power of flight greatly
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