IB Biology Topic C4.2.22 Recycling of All Chemical Elements Required by Living Organisms in Ecosystems Revision Notes (SL/HL)

IB Biology Topic C4.2.22 Recycling of All Chemical Elements Required by Living Organisms in Ecosystems Revision Notes (SL/HL) | RevisionDojo

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Ecosystems Recycle Every Chemical Element That Life Needs

Life depends on the continuous recycling of essential chemical elements within ecosystems.
Elements such as carbon, nitrogen, and phosphorus build the macromolecules that make up living organisms.
Because these resources are finite, ecosystems would collapse without recycling to return them to a usable form.

Example

Carbon, hydrogen, and oxygen form carbohydrates, lipids, and proteins.
Nitrogen and phosphorus are needed for proteins and nucleic acids.
About 15 other elements are needed in trace amounts, including potassium, sodium, and calcium.

Decomposers Return Elements to Inorganic Form

Saprotrophs, mainly bacteria and fungi, are central to nutrient cycling.
They break down dead organisms and waste, releasing the elements locked inside.
They convert complex organic compounds into inorganic forms such as ammonia, which plants can reabsorb.

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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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Ecosystems Recycle Every Chemical Element That Life Needs

Life depends on the continuous recycling of essential chemical elements within ecosystems.
Elements such as carbon, nitrogen, and phosphorus build the macromolecules that make up living organisms.
Because these resources are finite, ecosystems would collapse without recycling to return them to a usable form.

Example

Carbon, hydrogen, and oxygen form carbohydrates, lipids, and proteins.
Nitrogen and phosphorus are needed for proteins and nucleic acids.
About 15 other elements are needed in trace amounts, including potassium, sodium, and calcium.

Decomposers Return Elements to Inorganic Form

Saprotrophs, mainly bacteria and fungi, are central to nutrient cycling.
They break down dead organisms and waste, releasing the elements locked inside.
They convert complex organic compounds into inorganic forms such as ammonia, which plants can reabsorb.

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 C4.2.22: Recycling of All Chemical Elements Required by Living Organisms in Ecosystems Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Ecosystems Recycle Every Chemical Element That Life Needs

Decomposers Return Elements to Inorganic Form

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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Ecosystems Recycle Every Chemical Element That Life Needs

Decomposers Return Elements to Inorganic Form

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