Correct Answer: Water potential

Solution : The correct option is Water potential

The sign 'Yw' is used in plant-water connections to denote a plant's or plant tissue's water potential. Water potential (Yw) is a measure of the potential energy of water in a system that takes solute concentration, pressure, and gravity into consideration. Water potential is an important concept in understanding how water travels inside plants, including activities such as transpiration and soil water absorption. It explains the direction of water transport in different plant tissues as well as the overall water balance in plants.