In plants, this about apoplast and symplast water movement is true

The correct option is "being down a potential gradient".

In plants, water movement through both the apoplast and symplast pathways occurs along a water potential gradient (from a region of higher water potential to a region of lower water potential). This is a passive process driven by physical forces and concentration differences, ensuring spontaneous flow without the active expenditure of energy for the movement itself.

Let us break down why this statement is correct and why the other options do not apply to both pathways:

1. Apoplast vs. Symplast Pathways:
- Apoplast pathway: Water moves exclusively through the non-living parts of the plant, such as the cell walls and intercellular spaces. It does not cross any cell membranes.
- Symplast pathway: Water moves through the living parts of the cells, crossing the plasma membrane and entering the cytoplasm, traveling from cell to cell via cytoplasmic connections called plasmodesmata (interconnected protoplasts).

2. Down a Potential Gradient (The Common Feature):
For water to move spontaneously in any system (including plants), there must be a thermodynamic driving force. In both pathways, water moves from cells or areas with higher water potential (${\Psi }_w$) to areas with lower water potential (${\Psi }_w$). This potential gradient is created by transpiration at the leaves (which lowers water potential at the top) and absorption by the roots.

3. Why other options are incorrect:
- An equal rate of transport: Water movement through the apoplast is much faster because it faces less resistance (moving through cell walls). In contrast, the symplast pathway is slower as water must cross cell membranes and pass through narrow plasmodesmata.
- Conduction through interconnected protoplasts: This describes only the symplast pathway. The apoplast pathway occurs outside the protoplasts (in cell walls).
- Assistance by cytoplasmic streaming: Cytoplasmic streaming (movement of cytoplasm within a cell) facilitates transport specifically in the symplast pathway, but has no role in the non-living apoplast pathway.