Hachi's posts
Posted in it's literally just biology
Posted 5 years ago
★
Chain of water molecules can avoid these air bubbles by going through pits between adjacent tracheids or vessel elements
Chain of water molecules can avoid these air bubbles by going through pits between adjacent tracheids or vessel elements
Posted in it's literally just biology
Posted 5 years ago
★
Common in vessel elements (wider), occurs during drought or winter (xylem sap freezes)
Common in vessel elements (wider), occurs during drought or winter (xylem sap freezes)
Posted in it's literally just biology
Posted 5 years ago
★
Cavitation - formation of a water vapor pocket, breaks the chain of water molecules needed for transpirational pull
Cavitation - formation of a water vapor pocket, breaks the chain of water molecules needed for transpirational pull
Posted in it's literally just biology
Posted 5 years ago
★
Lowers water potential in root xylem → water flows passively in from the soil
Lowers water potential in root xylem → water flows passively in from the soil
Posted in it's literally just biology
Posted 5 years ago
★
Thick secondary walls prevent them from collapsing
Thick secondary walls prevent them from collapsing
Posted in it's literally just biology
Posted 5 years ago
★
Upward pull of sap creates tension in vessel elements and tracheids → pulls the walls inward
Upward pull of sap creates tension in vessel elements and tracheids → pulls the walls inward
Posted in it's literally just biology
Posted 5 years ago
★
Adhesion of water molecules to hydrophilic cellulose in xylem walls offsets the force of gravity
Adhesion of water molecules to hydrophilic cellulose in xylem walls offsets the force of gravity
Posted in it's literally just biology
Posted 5 years ago
★
Negative pressure potential of the leaves pulls water from the xylem as a result of water moving from higher to lower potential
Negative pressure potential of the leaves pulls water from the xylem as a result of water moving from higher to lower potential
Posted in it's literally just biology
Posted 5 years ago
★
Water evaporates from the film → air-water interface retreats into the cell wall and curves (due to high surface tension of water) → tension increases (more negative water pressure) → water from hydrated parts of the leaf are pulled to this area to reduce the tension → “pulling” is transferred to xylem by cohesion
Water evaporates from the film → air-water interface retreats into the cell wall and curves (due to high surface tension of water) → tension increases (more negative water pressure) → water from hydrated parts of the leaf are pulled to this area to reduce the tension → “pulling” is transferred to xylem by cohesion
Posted in it's literally just biology
Posted 5 years ago
★
Water adheres to the cellulose microfibrils of the mesophyll cell wall → water film
Water adheres to the cellulose microfibrils of the mesophyll cell wall → water film
Posted in it's literally just biology
Posted 5 years ago
★
Air outside the leaf is drier (lower water potential) → water diffuses out of the leaf via the stomata
Air outside the leaf is drier (lower water potential) → water diffuses out of the leaf via the stomata
Posted in it's literally just biology
Posted 5 years ago
★
In leaves - internal air spaces expose mesophyll to CO2, saturated with water vapor due to moist walls of cells
In leaves - internal air spaces expose mesophyll to CO2, saturated with water vapor due to moist walls of cells
Posted in it's literally just biology
Posted 5 years ago
★
Xylem sap is under negative pressure (tension)
Xylem sap is under negative pressure (tension)
Posted in it's literally just biology
Posted 5 years ago
★
Cohesion-tension hypothesis (pulling xylem sap) - transpiration pulls xylem sap upwards, and the cohesion of water molecules transmits this pull along the length of the plant
Cohesion-tension hypothesis (pulling xylem sap) - transpiration pulls xylem sap upwards, and the cohesion of water molecules transmits this pull along the length of the plant