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Chemical Fate in Environment: Pesticide Degradation

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Chemical Fate in Environment: Pesticide Degradation

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Questions and Answers

What is the primary mechanism by which glyphosate promotes the emergence of glyphosate-resistant weeds?

By increasing the expression of glyphosate-degrading enzymes in weeds

By directly inducing the evolution of glyphosate-resistant weeds through epigenetic modifications

By altering the soil microbiome to favor glyphosate-resistant microorganisms

By selecting for weeds with genetic mutations that confer glyphosate resistance (correct)

What is the primary factor that delays leaching and promotes soil degradation in the fate and transformation of glyphosate in soil?

Volatilization

Immobilization

Adsorption

Mineralization (correct)

Which of the following health effects is NOT associated with glyphosate exposure?

Endocrine disruption

Cardiovascular disease (correct)

Tumors

Reproductive issues

What is the approximate half-life of glyphosate in soil?

45-60 days Signup and view all the answers

What is the primary mechanism by which glyphosate affects microbial populations in soil?

By inhibiting microbial activity Signup and view all the answers

What is the primary factor that affects the dissipation of glyphosate in soil?

Erosivity of rain and erodibility of the soil Signup and view all the answers

Which of the following herbicides is a possible human carcinogen and increases the chance of liver tumors?

Metolachlor Signup and view all the answers

What is the primary method of dissipation for Metolachlor and Acetochlor?

Microbial degradation Signup and view all the answers

Which of the following emerging contaminants are formed through the interaction of residual disinfectants and organic matter in drinking water treatment plants?

Nitrosamines Signup and view all the answers

What is the primary characteristic of Per-Fluoroalkyl Substances (PFAS) that makes them 'forever chemicals'?

They are highly persistent in the environment Signup and view all the answers

Which of the following is an example of a Perfluoroalkyl sulfonamide (FASA) that may degrade to PFSAs and PFCAs?

Perfluoroalkyl sulfonamide ETHANOLS (FASA) Signup and view all the answers

What is the primary purpose of Flame Retardants?

To prevent or slow the growth of fire Signup and view all the answers