Question

In insects, Octopamine is:

• A. Neurotransmitter
• B. Neuromodulator
• C. Pheromone
• D. Kairomone

Hint:

Octopamine is the principal excitatory amine in insect flight systems. Many modern green insecticides (like formamidines) work by target-binding octopamine receptors.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Biogenic amines play critical roles in regulating insect behavior, metabolism, and synaptic signal transmission.

Step 2: Detailed Explanation:
Octopamine is a major biogenic amine in insects, often considered the invertebrate equivalent of noradrenaline (norepinephrine).
It functions primarily as a classical neurotransmitter at nerve-muscle junctions, as well as a neuromodulator and neurohormone.
It regulates diverse physiological actions such as flight initiation, mobilization of lipids, and arousal behavior.

Step 3: Final Answer:
In insects, Octopamine is classified as a neurotransmitter, which corresponds to option (A).