IB Biology Topic C4.1.18 Allelopathy and Secretion of Antibiotics Revision Notes (SL/HL)

IB Biology Topic C4.1.18 Allelopathy and Secretion of Antibiotics Revision Notes (SL/HL) | RevisionDojo

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Some Organisms Compete Using Chemicals, Not Contact

Organisms compete for nutrients, water, space, and light.
Some gain an edge by releasing chemicals that inhibit their competitors, a form of interference competition.
Plants do this through allelopathy, and microorganisms do it by secreting antibiotics.

Definition

Allelopathy

Allelopathy occurs when plants release chemicals, called allelochemicals, into the soil to inhibit the growth of nearby plants.

Allelopathy: Plants Poison the Soil Around Their Rivals

In allelopathy a plant releases allelochemicals that inhibit the germination and growth of nearby plants.
This leaves more light, water, and nutrients for the plant that made them.

How Allelopathy Works

The plant makes the chemicals
1. Allelochemicals are produced in leaves, roots, bark, and seeds.
The chemicals reach the soil
1. Rain leaches them out of the leaves.
2. Roots release them directly into the soil.
3. Decaying plant matter releases them as it breaks down.
The neighbours suffer
1. Seed germination is blocked.

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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 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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Some Organisms Compete Using Chemicals, Not Contact

Organisms compete for nutrients, water, space, and light.
Some gain an edge by releasing chemicals that inhibit their competitors, a form of interference competition.
Plants do this through allelopathy, and microorganisms do it by secreting antibiotics.

Definition

Allelopathy

Allelopathy occurs when plants release chemicals, called allelochemicals, into the soil to inhibit the growth of nearby plants.

Allelopathy: Plants Poison the Soil Around Their Rivals

In allelopathy a plant releases allelochemicals that inhibit the germination and growth of nearby plants.
This leaves more light, water, and nutrients for the plant that made them.

How Allelopathy Works

The plant makes the chemicals
1. Allelochemicals are produced in leaves, roots, bark, and seeds.
The chemicals reach the soil
1. Rain leaches them out of the leaves.
2. Roots release them directly into the soil.
3. Decaying plant matter releases them as it breaks down.
The neighbours suffer
1. Seed germination is blocked.

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 C4.1.18: Allelopathy and Secretion of Antibiotics Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Some Organisms Compete Using Chemicals, Not Contact

Allelopathy: Plants Poison the Soil Around Their Rivals

How Allelopathy Works

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

Some Organisms Compete Using Chemicals, Not Contact

Allelopathy: Plants Poison the Soil Around Their Rivals

How Allelopathy Works

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