Question

Water potential in the leaf tissue is positive (+) during

• A. excessive transpiration
• B. low transpiration
• C. excessive absorption
• D. guttation

Answer 1

Answer: (B)

low transpiration

Answer 2

Water potential depends on the number of water molecules in the system. More the number of water molecules, greater will be the water potential. Water potential of all solutions is negative in comparison to pure water which has water potential as zero. Under the conditions, when there are more water molecules in the system, water potential is expected to be higher, e.g., under conditions of low transpiration in leaf tissue the water potential is expected to be positive. When transpiration is low, considerably more water molecules will be stuffed up inside leaf in the intercellular spaces giving rise to a positive water potential.