Which of the following does not leave residue in the environment?

Insect growth regulator

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Ionization radiation

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Conjugation technique

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DDT

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Solution

The correct option is A Insect growth regulator
Insect growth regulator is a substance (chemical) that inhibits the life cycle of an insect. IGRs are typically used as insecticides to control populations of harmful pests, such as cockroaches or fleas. They mimic hormones in young insects. They disrupt how insects grow and reproduce and they do not leave residues in the environment.
Therefore, the correct answer is option A.

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