Which Structure or Compartment is Part of the Symplast

Question

Which structure or compartment is part of the symplast?
A) the interior of a vessel element
B) the interior of a sieve tube
C) the cell wall of a mesophyll cell
D) an extracellular air space
E) the cell wall of a root hair

Accepted Answer

The symplast refers to the continuous system of cytoplasm of cells interconnected by plasmodesmata. The interior of a sieve tube is part of the symplast because it is connected to neighboring cells through plasmodesmata, allowing for the direct cytoplasmic exchange of molecules.