IB Biology Topic D2.3.6 Effects of Water Movement on Cells with a Cell Wall Revision Notes (SL/HL)

IB Biology Topic D2.3.6 Effects of Water Movement on Cells with a Cell Wall Revision Notes (SL/HL) | RevisionDojo

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Plant Cells Are Turgid by Default in Hypotonic Environments

In healthy plants, turgor pressure is the default, because cells sit in a hypotonic environment where water enters and presses against the rigid cell wall.
The wall shapes how the cell responds to water movement in both hypotonic and hypertonic surroundings.

Turgor Pressure Keeps Plant Cells Firm in a Hypotonic Medium

In a hypotonic solution such as pure water, water moves into the cell by osmosis.
This makes the vacuole expand, pushing the cytoplasm against the cell wall.
The cell wall resists this pressure, preventing the cell from bursting.

Definition

Turgor Pressure

Turgor pressure is the pressure exerted by the cell contents against the cell wall.

Analogy

Think of a balloon inflating inside a rigid box.
The box does not expand, but the pressure inside keeps the balloon firm.
In the same way, the cell wall stops the cell bursting while turgor pressure keeps it firm.

Why Turgor Pressure Matters

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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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Plant Cells Are Turgid by Default in Hypotonic Environments

In healthy plants, turgor pressure is the default, because cells sit in a hypotonic environment where water enters and presses against the rigid cell wall.
The wall shapes how the cell responds to water movement in both hypotonic and hypertonic surroundings.

Turgor Pressure Keeps Plant Cells Firm in a Hypotonic Medium

In a hypotonic solution such as pure water, water moves into the cell by osmosis.
This makes the vacuole expand, pushing the cytoplasm against the cell wall.
The cell wall resists this pressure, preventing the cell from bursting.

Definition

Turgor Pressure

Turgor pressure is the pressure exerted by the cell contents against the cell wall.

Analogy

Think of a balloon inflating inside a rigid box.
The box does not expand, but the pressure inside keeps the balloon firm.
In the same way, the cell wall stops the cell bursting while turgor pressure keeps it firm.

Why Turgor Pressure Matters

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 D2.3.6: Effects of Water Movement on Cells with a Cell Wall Notes

Plant Cells Are Turgid by Default in Hypotonic Environments

Turgor Pressure Keeps Plant Cells Firm in a Hypotonic Medium

Why Turgor Pressure Matters

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Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Plant Cells Are Turgid by Default in Hypotonic Environments

Turgor Pressure Keeps Plant Cells Firm in a Hypotonic Medium

Why Turgor Pressure Matters

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

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics