LectureTopic24-PlantTranport-II

Bulk Flow

The movement of a fluid driven by pressure or gravity, essential in the transport of water and minerals in plants.

Xylem Sap

A watery solution containing water and dissolved minerals that is transported from the roots to the leaves in plants.

Root Pressure

A positive pressure generated in the roots that pushes water upward through the xylem when transpiration is low.

Guttation

The process of water exudation from the tips or edges of leaves, often associated with high root pressure.

Transpiration-Cohesion-Tension Mechanism

The process by which water vapor exits leaves through stomata, creating negative pressure that pulls water upward through the xylem.

Cohesion

The attraction between water molecules, allowing them to stick together and aiding in the transport of water in plants.

Adhesion

The attraction between water molecules and plant cell walls, helping to offset gravity during water transport.

Stomata

Small openings on the surface of leaves that regulate the exchange of gases and water vapor in plants.

Guard Cells

Cells that flank each stoma and control its opening and closing by changing shape based on turgor pressure.

Abscisic Acid

A plant hormone that signals stomata to close during water deficiency, thereby reducing water loss.

Translocation

The process of transporting sugars through the phloem from sources (sugar-producing parts) to sinks (sugar-consuming parts) in plants.

Phloem Sap

An aqueous solution high in sucrose that is transported through the phloem from sugar sources to sugar sinks.