Which structure secretes hormones directly into the bloodstream without using a duct? lacrimal gland adrenal gland oil gland salivary gland

The correct answer is Adrenal Glands.

Endocrine glands are called ductless glands because they secrete hormones directly into the bloodstream. The secretions are released into the bloodstream for the quick response. Adrenal gland secretes adrenaline that  is directly released into the bloodstream and affects the autonomous  nervous system, which controls the various functions of the body such as dilation of pupil, heart rate, secretion of sweat and saliva.

i think that it is plants