Final answer:
Plasmodesmata are specialized openings in the cell walls of plant cells that allow for communication between adjacent cells. They enable the transport of signal molecules and nutrients, facilitating the coordination of responses to external signals.
Step-by-step explanation:
Plasmodesmata are specialized openings in the cell walls of plant cells where the cytoplasm of adjacent cells is connected for communication.
Plasmodesmata are channels that pass between the cell walls of adjacent plant cells, allowing for the transport of signal molecules and nutrients from cell to cell.
These channels enable plant cells to coordinate their responses to external signals, making the entire plant into a giant communication network.