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Syllabus

Loss of Biodiversity — Syllabus

ICSE · Class 11 · Geography

What Loss of Biodiversity covers in ICSE Class 11 Geography: 4 topics, for the 2026-27 session. Part of the ICSE Class 11 Geography syllabus.

64 questions28 flashcards5 concepts

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4 Topics · ICSE Class 11 Geography · 2026-27

Topics in Loss of Biodiversity

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1. Meaning and Importance of Biodiversity Loss

  • Biodiversity loss is the shrinkage of species numbers and the degradation of their habitats.
  • Fast population growth and improvement in living conditions have increased pressure on natural resources.
  • Overpopulation and biodiversity loss have caused major damage in tropical regions.
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2. Types of Species in Loss of Biodiversity

  • From the viewpoint of loss of biodiversity, species are divided into three main classes: threatened, endangered, and extinct.
  • Threatened species are those whose lives are at risk.
  • WCMC's Red Data Books mention 66,000 plant and 2,000 animal species threatened worldwide.
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3. Geological Extinction Episodes

  • There are six recognised geological extinction episodes in Earth's history.
  • These episodes are Ordovician, Devonian, Permian, Triassic, Cretaceous, and Pleistocene.
  • Ordovician extinction occurred 500 million years ago and eliminated about 50% of animal families, including several trilobites.
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4. Causes of Extinction of Species

  • Habitat destruction is a major cause of species extinction.
  • Growing human population and modern activities are the main reasons for habitat destruction.
  • In 49 out of 61 old world tropical countries, more than 50% of wildlife habitat has been destroyed.

Key Concepts

Central concept: Loss of Biodiversity

Pressure on natural resourcesTropical zone damageZaire basin and Amazon basinTypes of speciesThreatened speciesEndangered speciesExtinct speciesGeological extinction episodes

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Frequently Asked Questions

What are the important topics in Loss of Biodiversity for ICSE Class 11 Geography?
Key topics in Loss of Biodiversity include Meaning and Importance of Biodiversity Loss, Types of Species in Loss of Biodiversity, Geological Extinction Episodes, Causes of Extinction of Species. Study these first, then practise questions on each for Class 11 exams.
How should I revise Loss of Biodiversity for Class 11 exams?
Learn the core ideas first, then work through the 64 practice questions on Loss of Biodiversity. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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