Question

What is the function of lumen in plants

Answer 1

In biology, a lumen , meaning "an opening"; plural lumina) is the inside space of a tubular structure, such as an artery or intestine. By extension, the term lumen is also used to describe the inside space of a cellular component or structure, such as the endoplasmic reticulum

Answer 2

lumen is aa empty space in any membrane or any organelle its function is storage of food or exchange of ions