NTA Abhyas NEET2020BotanyTransport in PlantsPractice
Water potential is equal to
Options
- Aψ s + O.P.
- Bψ s + T.P.
- Cψ p + ψ w
- Dψ s + ψ p
Correct answer
D. ψ s + ψ p
Step-by-step solution
Water potential is defined as the difference between the chemical potential of water at any point in a system and that of pure water under standard conditions. The unit of measurement of water potential is the pascal, Pa (1 megapascal, Mpa = 10 bars). It is represented by greek letter PSi (ψ). Water potential has two components solute potential which is always negative and pressure potential which is usually positive. Therefore, water potential ψ w is expressed as ψ w = ψ s + ψ p.