Chapter 3 Flashcards
Water Potential
A measure of water’s potential energy
Matric Potential
The potential energy generated by the attractive forces between water molecules and soil particles
Field Capacity
The max amount of water held by soil
Wilting Point
1.5mpa
Salinization
Process of repeated irrigation that causes soil salinity
Cohesion
The mutual attraction of water
Allows water to move up through empty remains of xylem cells
Root pressure
When osmotic potential in the roots of a plant draws in water from the soil and force it into the xylem
Transpiration
Leaves generate water potential as water evaporates from surface of leaf cells
Cohesion tension Theory
Water movement from roots to leaves due to water cohesion and water tension
Stomata
Small openings on leaf surfaces that are points of entry for CO2
Electromagnetic Radiation
Energy from the Sun
Photosynthetically Active Region
Wavelengths of light that are suitable for photosynthesis
400 to 700nm
Chloroplasts
Responsible for photosynthesis
Chlorophyll
Absorb red and violet light and reflect green and blue light
Carotenoids
Reflect orange and red
Allow plants to absorb a wider range of solar energy