Edexcel iGCSE Biology-5.3B Biodiversity- Study Notes- New Syllabus
Edexcel iGCSE Biology-5.3B Biodiversity- Study Notes- New syllabus
Edexcel iGCSE Biology-5.3B Biodiversity- Study Notes -Edexcel iGCSE Biology – per latest Syllabus.
Key Concepts:
5.3B understand the term biodiversity
Biodiversity
🔹 Introduction
Biodiversity = the variety of life on Earth.
Includes different species, genetic variation, and ecosystems.
High biodiversity = stable, healthy ecosystem.
📌 Key Points
- Levels of Biodiversity
- Species diversity → number of different species in an area
- Genetic diversity → variety of genes within a species
- Ecosystem diversity → variety of habitats & ecosystems
- Importance of Biodiversity
- Provides food, medicines, raw materials
- Maintains ecosystem stability (pollination, nutrient cycles, climate regulation)
- Allows species to adapt to changes → survival of ecosystems
- Threats to Biodiversity
- Deforestation
- Pollution
- Overhunting/overfishing
- Climate change
📊 Summary Table
| Aspect | Meaning | Example |
|---|---|---|
| Species diversity | Variety of species in an area | Rainforest with many plants/animals |
| Genetic diversity | Variation within one species | Different breeds of dogs |
| Ecosystem diversity | Range of different ecosystems | Coral reefs, forests, deserts |
📝 Quick Recap
Biodiversity = variety of life (species + genes + ecosystems).
Essential for resources, stability, adaptation, and survival.
Threatened by human activities (deforestation, pollution, climate change).