Loss of Biodiversity — Chapter Summary
ICSE · Class 11 · Geography
Summary of Loss of Biodiversity for ICSE Class 11 Geography. Part of the ICSE Class 11 Geography syllabus. Biodiversity loss means the shrinkage.
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Overview
Biodiversity loss means the shrinkage of species, their habitats, and the balance of natural life. Fast population growth, rising resource use, deforestation, pollution, hunting, and the spread of exotic species have all reduced natural diversity. Tropical regions are especially affected because the
Key Concepts
Biodiversity loss is the reduction
Biodiversity loss is the reduction in the variety of living organisms and the habitats that support them. It happens when natural ecosystems are damag
Threatened species are species whose lives
Threatened species are species whose lives are at risk. WCMC Red Data Books mention 66,000 plant species and 2,000 animal species as threatened worldw
Endangered species are species that face
Endangered species are species that face a high risk of extinction in the near future. Mace and Lande (1991) defined endangered species as species wit
A species is extinct when no
A species is extinct when no member of it remains alive anywhere in the world.
Six major extinction episodes are recognised
Six major extinction episodes are recognised in Earth's history: Ordovician, Devonian, Permian, Triassic, Cretaceous, and Pleistocene.
Learning Objectives
- Understand the meaning of biodiversity loss and its causes
- Distinguish between threatened, endangered, and extinct species
- Identify major geological extinction episodes in Earth's history
- Explain how human activities increase the risk of extinction
- Recognise the importance of habitat protection, wildlife control, and conservation
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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