What is detoxification in insect biology?

What is detoxification in insect biology?

• A. The biochemical breakdown or removal of toxins, allowing survival against plant defenses and insecticides.
• B. The production of toxins by insect glands.
• C. The storage of toxins in fat tissue.
• D. The absorption of toxins without modification.

Answer: (A)

Detoxification is the biochemical breakdown or removal of toxins, enabling insects to survive toxic plant compounds and insecticides. Insects accomplish this mainly through enzyme systems that modify xenobiotics: Phase I reactions introduce or expose functional groups through oxidation, reduction, or hydrolysis (often via cytochrome P450 enzymes, esterases, or related enzymes); Phase II reactions attach polar groups such as glutathione, sulfate, or sugars to make substances more water-soluble; and Phase III transporters move these modified toxins out of cells for excretion. This process allows insects to tolerate or overcome plant defenses and chemical controls. For example, many herbivores upregulate P450s to metabolize plant alkaloids, and some pests use esterases and glutathione S-transferases to detoxify insecticides. The other ideas describe different strategies—producing toxins for defense, storing toxins (sequestration), or absorbing toxins without modification—which are not detoxification.

Detoxification is the biochemical breakdown or removal of toxins, enabling insects to survive toxic plant compounds and insecticides. Insects accomplish this mainly through enzyme systems that modify xenobiotics: Phase I reactions introduce or expose functional groups through oxidation, reduction, or hydrolysis (often via cytochrome P450 enzymes, esterases, or related enzymes); Phase II reactions attach polar groups such as glutathione, sulfate, or sugars to make substances more water-soluble; and Phase III transporters move these modified toxins out of cells for excretion. This process allows insects to tolerate or overcome plant defenses and chemical controls. For example, many herbivores upregulate P450s to metabolize plant alkaloids, and some pests use esterases and glutathione S-transferases to detoxify insecticides. The other ideas describe different strategies—producing toxins for defense, storing toxins (sequestration), or absorbing toxins without modification—which are not detoxification.