Forces Driving Transpiration

These flashcards cover key concepts related to the forces driving transpiration and the associated terms used in botany.

Transpiration

Modulated evaporation from plant surfaces to the atmosphere.

Water potential

A measure of water concentration, with pure water having a potential of 0.

Stomata

Small openings in plant leaves that control gas exchange and transpiration.

High water potential

Typically found inside leaves, where water concentration is higher than in the atmosphere.

Low water potential

Commonly found in the atmosphere, indicating lower water concentration.

Relative humidity

The amount of moisture in the air compared to the maximum amount the air can hold at that temperature.

Transpiration rate

Reflects water potential differences and indicates how much water is lost from plant surfaces.

MPa

Millipascals, a measure of pressure used in water potential measurements.

Foggy days effect on transpiration

Little transpiration occurs on foggy days due to higher water concentration outside the leaf.

Evaporation pan

A tool used to measure the rate of evaporation from a water surface.