IB Biology Topic B3.2.17 Generation of Root Pressure in Xylem Vessels by Active Transport of Mineral Ions Revision Notes (HL)

IB Biology Topic B3.2.17 Generation of Root Pressure in Xylem Vessels by Active Transport of Mineral Ions Revision Notes (HL) | RevisionDojo

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Root Pressure Pushes Water Up the Xylem

Definition

Root pressure

A positive hydrostatic pressure in the roots that helps push water up the xylem when transpiration is low.

Root pressure is a positive pressure generated in the roots that pushes water up the xylem.
Unlike transpiration pull, which draws water up under tension, root pressure is a pushing force that works from the bottom.
It is an extra mechanism that matters most when transpiration is minimal, such as at night, in high humidity, or in early spring before leaves develop.

Active Transport of Ions Sets Up the Pressure

Ions are pumped into the xylem
1. Root cells actively transport mineral ions such as potassium and calcium from the soil and into the root xylem.
2. This moves the ions against their concentration gradient, so it needs energy from ATP.

Note

The xylem vessels themselves are dead and cannot pump ions.
The surrounding living root cells do the active transport.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Root Pressure Pushes Water Up the Xylem

Definition

Root pressure

A positive hydrostatic pressure in the roots that helps push water up the xylem when transpiration is low.

Root pressure is a positive pressure generated in the roots that pushes water up the xylem.
Unlike transpiration pull, which draws water up under tension, root pressure is a pushing force that works from the bottom.
It is an extra mechanism that matters most when transpiration is minimal, such as at night, in high humidity, or in early spring before leaves develop.

Active Transport of Ions Sets Up the Pressure

Ions are pumped into the xylem
1. Root cells actively transport mineral ions such as potassium and calcium from the soil and into the root xylem.
2. This moves the ions against their concentration gradient, so it needs energy from ATP.

Note

The xylem vessels themselves are dead and cannot pump ions.
The surrounding living root cells do the active transport.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic B3.2.17: Generation of Root Pressure in Xylem Vessels by Active Transport of Mineral Ions Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Root Pressure Pushes Water Up the Xylem

Active Transport of Ions Sets Up the Pressure

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Root Pressure Pushes Water Up the Xylem

Active Transport of Ions Sets Up the Pressure

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account