Question

Which of the following are mechanisms through which pesticide degradation can occur?

1. Pesticide degradation can occur through chemical degradation, photo-degradation, and microbial degradation.
2. Pesticides only degrade through absorption into plants.
3. Degradation primarily happens through physical transport processes like runoff.
4. Pesticides do not degrade; they only volatilize or leach.

• A. i, ii
• B. None of these
• C. i only
• D. ii only

Answer 1

Answer:

C. i only

• Degradation - Pesticide degradation can occur either through chemical degradation, photo-degradation or microbial degradation.

• Bioaccumulation - Bioaccumulation refers to pesticide accumulation in various tissues of a living organism in concentration much higher than the surrounding environment.

• Bioaccumulation encompasses bioconcentration and biomagnification.

• Bioconcentration is the direct uptake of a substance by a living organism from the medium through the skin, lungs and gills.

• Biomagnification occur from the dietary uptake.