Discussion
Which among the following is monophagous insect pest?
Answer: A
The monophagous pest among these is the Pink bollworm.
A monophagous pest feeds on a single host or a very narrow range of closely related plants. The pink bollworm, Pectinophora gossypiella, depends on cotton, feeding inside its flowers, bolls and seeds, and is the standard example of a monophagous pest in Indian entomology.
White grubs feed on the roots of many crops, and the pink stem borer, Sesamia inferens, attacks rice, maize, wheat, sugarcane and other grasses, so both are polyphagous. That also rules out "Both (A) and (C)".
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