Q. In plant-water relationships, symbol YW is used to represent ______:
Answer: Water potential
Notes: Water potential is the potential energy of water per unit volume relative to pure water in reference conditions. Hence, it quantifies the tendency of water to move from one area to another due to osmosis, gravity, mechanical pressure, or matrix effects such as surface tension. Water potential is typically expressed in potential energy per unit volume and very often is represented by the famous Greek letter.