B3.1 Transpiration (SL)

This set of flashcards covers key terms related to plant systems and the process of transpiration.

Transpiration

The loss of water vapor from a plant, primarily through stomatal pores in the leaves.

Stomata

Pores located on the underside of leaves that facilitate gas exchange.

Mass Flow

The movement of a fluid along a pressure gradient; in plants, it refers to the flow of water through xylem vessels from roots to leaves.

Osmosis

The diffusion of water across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Evaporation

The process by which water is converted from a liquid state to a vapor.

Capillary Action

The ability of water to flow in narrow spaces against gravity, facilitating water movement in xylem vessels.

Aquaporins

Channel proteins in root cell membranes that facilitate the transport of water.

Guard Cells

Specialized cells that flank stomata and regulate their opening and closing to control gas exchange and water loss.

Cohesion

The attraction between water molecules, primarily due to hydrogen bonding.

Adhesion

The attraction between water molecules and the surfaces of xylem walls.