5. It has been observed that a mosquitofish which live in drainage ditches of co

Question

5. It has been observed that a mosquitofish which live in drainage ditches of cotton fields in the Mississippi Delta are greater than 1,000-times more resistant to the neurotoxic effects of parathion than that of the exact same species of mosquitofish found in uncontaminated streams. Parathion is an organophosphate insecticide which requires metabolic activation to its toxic form. Given this information, list five possible reasons that could account for increased resistance of the Delta fish to the insecticide.

Explanation / Answer

Malathion is a organophosphorus insecticide used in the control of agricultral peat as well as house hold pest which icause a damage to human property.The development of the resisteance of Delta fish pest is because of the following reason:

1. Organophosphorus pesticide reacts with insect body an enzyme acetyl choline which is forms a complex with malathion which is not much stable.

2. The acetyl choline complex may get hydrolysed rapidly

3. The concentration of the malathione in insect body may be sufficiently low

4..Malathion may not be absorbed in the insect body may be due to its hydrophobic nature

5.Number of biocontrol agents may be decreased in the environment .

6.Repeated use of malathion the Delta fish has developed resistance against it.

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