Which of the following is an example of a physical poison?

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AArsenicals

BHydrogen cyanide

CMalathion

DInert dusts

Answer:

Physical poison - The pesticide or toxicant will not react chemically but kill the insect either by asphyxiation or desiccation.
Mineral oil closes the spiracles and causes asphyxiation. So mineral oil is used for soft bodied insects like aphids.
Activated clay exerts a physical effect on wax monolayer and create spaces so that depletion of moisture in insect cell occurs. Activated clay is used in storage pest management.
Eg: Mineral oil, Inert dusts - Ash, silicagel, activated clay.

Related Questions:

Which of the following statements about heavy metal uptake by plants is correct?

Vegetables like brinjal, gourd, spinach, coriander, tomato, and pumpkin are susceptible to heavy metal uptake by their roots.
Heavy metals are not absorbed by the roots of plants.
Heavy metals are only absorbed by the leaves of plants.
Plants can effectively remove heavy metals from the soil without any risk.