Which cells function as "life support systems" for sieve tube elements?

Question

Quizplus · Accepted Answer

Companion cells are specialized cells that provide metabolic support to sieve tube elements, which lack nuclei and other organelles necessary for cellular processes. They maintain and transport nutrients, such as sugars, hormones, and amino acids, through plasmodesmata (intercellular channels) from companion cells to sieve tube elements, allowing for growth, development, and survival of the plant. Vessel elements and tracheary elements are water-conducting cells found in xylem tissue, while fiber cells and collenchyma cells provide structural support to the plant.

Which Cells Function as "Life Support Systems" for Sieve Tube