IB Biology Topic C3.1.23 Positive Feedback in Fruit Ripening and Ethylene Production Revision Notes (HL)

IB Biology Topic C3.1.23 Positive Feedback in Fruit Ripening and Ethylene Production Revision Notes (HL) | RevisionDojo

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Ethylene Drives Fruit Ripening Through a Positive Feedback Loop

Fruit ripening is controlled by ethylene (IUPAC name ethene), a simple gas that acts as a phytohormone.
It triggers ripening in many fruits and is a classic example of positive feedback.

Definition

Positive feedback

Positive feedback is a process where the end product of a reaction amplifies or enhances the initial stimulus, creating a self-reinforcing cycle.

Definition

IUPAC name

An IUPAC name is a name given to a chemical compound by the International Union of Pure and Applied Chemistry (IUPAC). IUPAC is an international organization that develops and maintains a standardized system for naming chemical compounds.

Ethylene Is a Simple Gas That Signals Ripening

Ethylene is a phytohormone that plays a key role in fruit ripening.
It is a simple gaseous molecule with the formula C2H4.

Note

Most parts of a plant make a little ethylene all the time.
Its production rises sharply during fruit ripening.

The Four Changes Ethylene Triggers in Fruit

Colour change: chlorophyll breaks down, revealing carotenoids (orange) or anthocyanins (red).
Softening: enzymes break down cell wall components, making the fruit softer.
Sweetening: starches and acids are converted into sugars.
Aroma production: volatile compounds are made, giving the fruit its characteristic smell.

Ethylene and Fruit Ripening

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IB Biology Topic C3.1.23: Positive Feedback in Fruit Ripening and Ethylene Production Notes

Ethylene Drives Fruit Ripening Through a Positive Feedback Loop

Ethylene Is a Simple Gas That Signals Ripening

The Four Changes Ethylene Triggers in Fruit

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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Ethylene Drives Fruit Ripening Through a Positive Feedback Loop

Ethylene Is a Simple Gas That Signals Ripening

The Four Changes Ethylene Triggers in Fruit

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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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic C3.1.23: Positive Feedback in Fruit Ripening and Ethylene Production Notes

Ethylene Drives Fruit Ripening Through a Positive Feedback Loop

Ethylene Is a Simple Gas That Signals Ripening

The Four Changes Ethylene Triggers in Fruit

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

Ethylene Drives Fruit Ripening Through a Positive Feedback Loop

Ethylene Is a Simple Gas That Signals Ripening

The Four Changes Ethylene Triggers in Fruit

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