Which of the following is not a part of apoplast?

The apoplast is the space outside the plasma membrane of plant cells, which includes cell walls, intercellular spaces, and the lumens of xylem vessels and tracheids. The apoplast provides a pathway for the movement of water and solutes through plant tissues.

Plasmodesmata, on the other hand, are channels that connect the cytoplasm of adjacent plant cells, allowing for the exchange of small molecules and ions. Plasmodesmata are not part of the apoplast, as they are located inside the plasma membrane and connect the cytoplasm of neighboring cells.