IB Biology Topic A4.2.1 Biodiversity as the Variety of Life in All Its Forms, Levels and Combinations Revision Notes (SL/HL)

IB Biology Topic A4.2.1 Biodiversity as the Variety of Life in All Its Forms, Levels and Combinations Revision Notes (SL/HL) | RevisionDojo

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Understanding Biodiversity: Life at Every Level

Definition

Biodiversity

Biodiversity is the total variety of life on Earth.

It includes all living organisms, the ecosystems they inhabit, and the genetic differences within and between populations.
Biodiversity can be understood on three levels:
1. Ecosystem Diversity
2. Species Diversity
3. Genetic Diversity
These levels form the foundation for ecosystems' ability to function, adapt, and sustain life.

Ecosystem Diversity: Different Habitats Provide Different Services

Ecosystem diversity refers to the variety of ecosystems within a region or across the globe.
This includes their physical characteristics and the organisms they support.

Example

Rainforests, coral reefs, grasslands, wetlands, and tundra are all examples of ecosystems.

Why is ecosystem diversity important?
Ecosystems provide critical services that support life, such as:
1. Climate regulation: Forests absorb CO2 and moderate global temperatures.
2. Water purification: Wetlands filter pollutants from water and reduce flood risks.
3. Soil fertility: Grasslands prevent soil erosion and enrich it with nutrients.
Each ecosystem interacts with others.

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Note

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Tip

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IB Biology Topic A4.2.1: Biodiversity as the Variety of Life in All Its Forms, Levels and Combinations Notes

Understanding Biodiversity: Life at Every Level

Ecosystem Diversity: Different Habitats Provide Different Services

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Understanding Biodiversity: Life at Every Level

Ecosystem Diversity: Different Habitats Provide Different Services

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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 A4.2.1: Biodiversity as the Variety of Life in All Its Forms, Levels and Combinations Notes

Understanding Biodiversity: Life at Every Level

Ecosystem Diversity: Different Habitats Provide Different Services

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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Understanding Biodiversity: Life at Every Level

Ecosystem Diversity: Different Habitats Provide Different Services

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