Factors Influencing OCP Degradation in Freshwater Environments
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Questions and Answers

How does sorption in soil affect the mobility of Organochlorine Pesticides (OCPs)?

  • Increases mobility
  • Reduces mobility (correct)
  • Has no effect on mobility
  • Causes immediate degradation

Which of the following is NOT a degradation pathway for OCPs?

  • Redox reactions
  • Photolysis
  • Hydrolysis
  • Fermentation (correct)

Which environmental condition favors the reduction reaction in the degradation of OCP residues?

  • Low iron content
  • Low oxygen levels (correct)
  • High pH
  • Neutral pH

What type of compounds are hydrolyzed through the hydrolysis pathway?

<p>Esters (D)</p> Signup and view all the answers

How does photolysis contribute to the degradation of OCP residues?

<p>Direct photolysis contributes to degradation (C)</p> Signup and view all the answers

What role does microbial population play in the biotic degradation of OCP residues?

<p>It accelerates the degradation by providing energy (A)</p> Signup and view all the answers

What is the role of water in photochemical reactions?

<p>Creates hydroxyl radicals (D)</p> Signup and view all the answers

Which compound can organisms convert OCPs into as part of detoxification or metabolic processes?

<p>Trichloroacetic acid (TCAA) (A)</p> Signup and view all the answers

In what form can Methylosinus trichosporium OB3b produce methane monooxygenase to convert trichloroethylene?

<p>Trichloroacetic acid (TCAA) (C)</p> Signup and view all the answers

What do hydroxyl radicals participate in within photochemical reactions?

<p>Mediating xenobiotic transformation (A)</p> Signup and view all the answers

Which process is NOT involved in the photochemical reactions mentioned in the text?

<p>Halogenation (A)</p> Signup and view all the answers

What can soil extracts with halogenating potential contribute to the formation of from organic acids like humic acid?

<p>Trichloroacetic acid (TCAA) (C)</p> Signup and view all the answers

Which process influences the degradation of OCPs due to their association with micro-organic compounds?

<p>Sorption and binding by organic soil components (D)</p> Signup and view all the answers

What is a significant property of OCPs that contributes to their high stability against degradation in the environment?

<p>Low solubility in water (C)</p> Signup and view all the answers

Which organisms tend to accumulate OCPs and are an important part of the food chain?

<p>Benthic organisms like crabs and shrimps (B)</p> Signup and view all the answers

What is one important factor influencing the residue levels of OCPs in sediment?

<p>Particle size distribution (C)</p> Signup and view all the answers

Which process could contribute to the degradation of OCP residues through exposure to light?

<p>Volatilization and photodecomposition (D)</p> Signup and view all the answers

What is a key role of microorganisms in the degradation of OCP residues?

<p>Contributing to biotic degradation (D)</p> Signup and view all the answers

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