IB Biology Topic D3.1.12 Dispersal and Germination of Seeds Revision Notes (SL/HL)

IB Biology Topic D3.1.12 Dispersal and Germination of Seeds Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

Seed Dispersal Moves Offspring Away From the Parent to Spread the Species

A dandelion seed drifting far from its parent plant to find a spot to grow is doing seed dispersal.
This spreads the species and reduces competition between parent and offspring.
Combined with germination, it sets up the growth of the next generation.

Definition

Seed dispersal

Seed dispersal is the process by which seeds are transported away from the parent plant to new locations, reducing competition for resources and increasing the likelihood of successful germination and growth.

Seed Dispersal and Pollination Are Different Stages With Different Jobs

Pollination transfers pollen for fertilisation and happens before fertilisation.
Seed dispersal moves the finished seeds to new locations and happens after fertilisation.

Seed Dispersal	Pollination
Moves seeds to new locations.	Transfers pollen for fertilization.
Occurs after fertilization.	Occurs before fertilization.
Methods: wind, water, animals, explosion.	Methods: wind, animals, water.

Tip

Think of seed dispersal as the move-out stage of the life cycle and pollination as the courtship phase.

Plants Disperse Seeds by Wind, Water, Animals, and Explosion

Wind dispersal: seeds are light and aerodynamic, so they travel long distances on the breeze.
Water dispersal: seeds float and survive for long periods, letting them drift to new shores.
Animal dispersal: animals eat fruits and excrete the seeds far away, or seeds hitch a ride on fur.

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Excepteur sint occaecat cupidatat non proident

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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 nisi ut aliquip ex ea commodo consequat.

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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Seed Dispersal Moves Offspring Away From the Parent to Spread the Species

A dandelion seed drifting far from its parent plant to find a spot to grow is doing seed dispersal.
This spreads the species and reduces competition between parent and offspring.
Combined with germination, it sets up the growth of the next generation.

Definition

Seed dispersal

Seed Dispersal and Pollination Are Different Stages With Different Jobs

Pollination transfers pollen for fertilisation and happens before fertilisation.
Seed dispersal moves the finished seeds to new locations and happens after fertilisation.

Seed Dispersal	Pollination
Moves seeds to new locations.	Transfers pollen for fertilization.
Occurs after fertilization.	Occurs before fertilization.
Methods: wind, water, animals, explosion.	Methods: wind, animals, water.

Tip

Think of seed dispersal as the move-out stage of the life cycle and pollination as the courtship phase.

Plants Disperse Seeds by Wind, Water, Animals, and Explosion

Wind dispersal: seeds are light and aerodynamic, so they travel long distances on the breeze.
Water dispersal: seeds float and survive for long periods, letting them drift to new shores.
Animal dispersal: animals eat fruits and excrete the seeds far away, or seeds hitch a ride on fur.

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 D3.1.12: Dispersal and Germination of Seeds Notes

Seed Dispersal Moves Offspring Away From the Parent to Spread the Species

Seed Dispersal and Pollination Are Different Stages With Different Jobs

Plants Disperse Seeds by Wind, Water, Animals, and Explosion

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

Seed Dispersal Moves Offspring Away From the Parent to Spread the Species

Seed Dispersal and Pollination Are Different Stages With Different Jobs

Plants Disperse Seeds by Wind, Water, Animals, and Explosion

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