Question

When is pressure potential positive?

Answer 1

Answer:

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Explanation:

In turgid plant cells it usually has a positive value as the entry of water causes the protoplast to push against the cell wall (see turgor). In xylem cells there is a negative pressure potential, or tension, as a result of transpiration. Water at atmospheric pressure has a pressure potential of zero.

Answer 2

Answer:

Pressure potential is usually positive but negative in the case of xylem vessels. It was known formerly as wall pressure or turgor pressure. In a turgid plant cell, pressure potential is usually positive but, negative in case of xylem, the potential pressure of xylem in a transpiring plant, which is under considerable tension, will be negative