What is the notable effect of organophosphates on insects?

Organophosphates are a class of chemicals widely used in pest control due to their ability to target the nervous systems of insects. The notable effect of organophosphates lies in their mechanism of action, which involves the inhibition of an enzyme called cholinesterase. This enzyme is crucial for breaking down acetylcholine, a neurotransmitter that transmits nerve signals. When cholinesterase is inhibited, acetylcholine accumulates in the synapses, resulting in continuous stimulation of the nervous system. This overstimulation can lead to paralysis and eventual death in insects.

The other statements do not accurately represent the primary function of organophosphates. While some pesticides do have long residual effects, organophosphates primarily act quickly upon exposure rather than having a prolonged effect. They do not promote insect population growth; in fact, they are specifically designed to reduce pest numbers. Additionally, while some pesticides may disrupt digestion, the primary action of organophosphates focuses on the impairment of the nervous system through cholinesterase inhibition.