Describe: $(1)$ volatile endocrine

(N/A) In the context of plant physiology,the term 'volatile endocrine' refers to $Ethylene$ $(C_2H_4)$.
$Ethylene$ is a simple gaseous plant hormone (phytohormone).
It is categorized as a volatile substance because it exists in a gaseous state at physiological temperatures and can diffuse through the air to affect neighboring tissues or plants.
It acts as an endocrine-like signal because it is produced in one part of the plant and transported to other parts to regulate various physiological processes,such as fruit ripening,senescence,and abscission.