How does a Contact Poison cause the death of a pest species?

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ABy absorption through roots

BBy inhalation through spiracles

CBy direct contact with the toxicant

DBy disrupting the digestive system

Answer:

Stomach poison: The insecticide applied on the leaves and other parts of the plant when ingested into the pest, act in the digestive system of the insect pest and bring about the death of the pest.
Eg: Malathion, parathion
Contact Poison: The pesticide or toxicant causes death of the pest species by means of contact
Eg: Fenvalerate

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