Water Potential Concepts and Applications

Water potential is the difference in free energy between pure water and a solution, crucial for understanding water movement. It consists of solute and pressure potential, introduced by Slater and Taylor. Measured relative to pure water, its standard is zero. Water moves from higher to lower potential until equilibrium. Solutes lower water potential, while pressure can increase it. Factors like solutes, pressure, and temperature affect water potential, impacting plant water transport.

What are the two main components that determine water potential?

• Solute potential and temperature potential

• Solute potential and pressure potential

• Temperature potential and volume potential

• Pressure potential and temperature potential

Who introduced the term 'water potential'?

• Einstein

• Newton

• Slater and Taylor

• Maya

How is water potential of pure water defined?

• As 100 bars

• As 10 bars

• As zero

• As one Pascal

In which direction does water move between two regions with different water potentials?

• From lower to higher water potential

• From higher to lower water potential

• From higher to higher water potential

• From lower to lower water potential

What happens to water movement when equilibrium is reached between two systems?

• Water movement becomes random

• Water movement reverses

• Water movement ceases

• Water movement increases

What is the effect of dissolving solutes in pure water on its water potential?

• Decreases water potential

• Increases water potential

• Has no effect

• Makes water potential positive

How does solute concentration affect solute potential?

• Higher solute concentration increases solute potential

• Higher solute concentration decreases solute potential

• Solute concentration has no effect

• Solute concentration makes solute potential positive

What happens to water potential when pressure greater than atmospheric pressure is applied?

• Water potential increases

• Water potential becomes zero

• Water potential decreases

• Water potential remains the same

What role does pressure potential play in plant systems?

• It makes water transport random

• It decreases water transport

• It increases water transport

• It has no role

What is the typical water potential of leaves in xerophytes?

• Zero bars

• Minus 10 bars

• Minus 15 bars

• Minus 5 bars