2f Movement of Water and Solutes

Flashcards covering key concepts related to transpiration and assimilate streams in plants.

Transpiration Stream

The movement of water and minerals through plants from roots to leaves.

Assimilate Stream

The translocation of photosynthate from sources (like leaves) to sinks (like roots or fruits).

Xylem

Vascular tissue responsible for the transport of water and nutrients from roots to various parts of the plant.

Phloem

Vascular tissue involved in the transport of sugars and other metabolic products downward from the leaves.

Stomata

Small openings on the surface of leaves that regulate gas exchange and transpiration.

Guard Cells

Cells surrounding stomata that control their opening and closing in response to environmental conditions.

Cohesion-Tension Theory

A theory explaining the ascent of sap in plants, based on the cohesion of water molecules and tension created during transpiration.

Casparian Strip

A band of cell wall material in the endodermis that blocks passive flow of water and solutes into the vascular system of the root.

Pressure-Flow Hypothesis

Explains how sugars are transported in phloem by osmotic pressure gradients.

Osmosis

The movement of water molecules through a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration.