Step 1: Understanding plant resistance.
Chemical composition of plants plays an important role in resistance against pests.
Step 2: Role of aspartic acid.
High aspartic acid and low sugar content make maize tissues unsuitable for stem borer feeding.
Step 3: Option analysis.
Stem borer is an insect pest affected by biochemical resistance, unlike fungal or viral diseases.
Step 4: Conclusion.
Thus, maize becomes resistant to stem borer infestation.