Week 11 Flashcards

Diffusion

Movement of solutes from high concentration to low concentration due to random molecular motion.

Osmosis

Movement of water across a semipermeable membrane from high water potential to low water potential.

Hypertonic Solution

a solution with a lower concentration of solutes outside, causing water to move out of a cell placed in it.

Simple Diffusion

A passive movement of molecules directly through to the membrane from high to low concentration.

Plant-Available Water

The amount of water the plant can use.

Cavitation

Air bubble in the xylem that breaks the water column and disrupts water flow caused by erosion.

Root Pressure

Positive pressure generated in roots by solute loading.

Adhesion

The attraction between water molecules and the walls of the xylem with the helped from gravity

Cohesion-Tension Theory

How plants move water upward from the soil.

Field Capacity

Water left in soil after drainage, stored in small pores

Willing Point

Soil moisture level where water is held too tightly for plants.

Saturation (Soil)

The condition where soil pores are filled with water

Solute potential

Component of water potential affected by solute concentration.

Active Transport

Movement of molecules from low to high concentration

Water Potential

Energy of water in a system taking the direction of water to move.

Pressure Potential

Component of water potential affected by solute concentration.

Cohesion

Attraction between water molecules that helps maintain water in the xylem.

Turgor Pressure

Pressure created when water fills the central vacuole and pushes against the membrane against cell wall.

Hyotonic Solution

A environment with low solute concentration outside the cell.

cohesion